16 Days. Two Days Review - Use FOIL and the Distributive Property to multiply polynomials.
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Transcript of 16 Days. Two Days Review - Use FOIL and the Distributive Property to multiply polynomials.
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Chapter 5 – Factoring and Solving Quadratics
16 Days
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Factoring QuadraticsTwo Days
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Review - Use FOIL and the Distributive Property to multiply polynomials.
Warm up -Multiplying Polynomials
)5)(12( xx
)5)(3( xx
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Writing a polynomial as a product of its factors.
Essentially undoing the multiplication. Purposes of factoring:
◦ Simplifying◦ Rewriting◦ Solving
Factoring Polynomials
162x 24102 xx
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GCF
Types of Factoring
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Grouping
Types of Factoring
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Difference of Squares
Types of Factoring
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Difference of Squares Formula
Types of Factoring
))((22 bababa
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Perfect Square Trinomials
Types of Factoring
962 xx 22 44 yxyx
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Perfect Square Trinomial Formulas
Types of Factoring
222 )(2 bababa
222 )(2 bababa
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Trinomials (a=1)
Types of Factoring
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Trinomials (a≠1)
Types of Factoring
352 2 xx 26 2 xx
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Sum and Difference of Cubes Formulas
Types of Factoring
)2)(( 2233 yxyxyxyx
)2)(( 2233 yxyxyxyx
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Sum and Difference of Cubes
Types of Factoring
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pg 263 (# 2-30 even)
Homework
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Factoring Practice
492
1811
183
16
67
2
2
2
2
2
xx
xx
xx
x
xx
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More Factoring Practice
2516
656
31310
462
9
2
2
2
2
3
x
xx
xx
xx
xx
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Solving Quadratics by Factoring
Two Days
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Question: How can we multiply two or more numbers together and get a product that equals zero?
For any real numbers a and b, if ab=0, then either a=0, b=0, or both.
Zero Product Property
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In this first example, the equation is already factored and is set equal to zero. To solve, simply set the individual factors equal to zero.
x 3 2x 1 0
x 3 0 or 2x 1 0
x 3 or 2x 1
x 3 or x 1
2
The solutions are -3 and 1/2.
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In this example, you must first factor the equation. Notice the familiar pattern. After factoring, set the individual factors equal to zero.
9x2 4 0
3x 2 3x 2 03x 2 0 or 3x 2 0
3x 2 or 3x 22 2
or3 3
x x
Factor using “difference of two squares.”
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In the next example, you must set the equation equal to zero before factoring. Then set the individual factors equal to zero and solve.
x2 6x 27 0x 9 x 3 0
x 9 0 or x 3 0
9 or 3x x
x2 27 6x
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This one uses a different technique than the previous ones. Really, this is something you should consider at the beginning of every factoring problem. See if you can solve it.
2x x 4 0
2x 0 or x 4 0
0 or 4x x
2x2 8x 0Did you take out GCF?
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Now, try several problems. Write these on your own paper, showing all steps
carefully. 1. 3y 5 2y 7 0
2. x2 x 12
3. d2 5d 0
4. 4c2 25
5. 18u2 1 3u
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Here are the answers. For help, click on the
numbers.
1. 2. 3. 4. 5.
If all are correct, you’re finished!
y5 3 or y 7 2
x 4 or x3
d 0 or d 5
c 5 2 or c 5 2
u 1 6 or u 1 3
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3y 5 2y 7 0
3y 5 0 or 2y 7 0
3y 5 or 2y 7
y5 3 or y 7 2
Back to questions
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x2 x 12
x2 x 12 0
x 4 x 3 0
x 4 0 or x 3 0
x 4 or x3 Back to questions
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d2 5d 0
d d 5 0
d 0 or d 5 0
d 0 or d 5
Back to questions
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4c2 25
4c2 25 0
2c 5 2c 5 0
2c 5 0 or 2c 5 0
2c 5 or 2c5
c 5 2 or c 5 2
Back to questions
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18u2 3u 1
18u2 3u 1 0
6u 1 3u 1 0
6u 1 0 or 3u 1 0
6u 1or 3u 1
u 1 6 or u 1 3Back to questions
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Solving Quadratics Using Other Methods
One Day
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Solve by taking Square Root
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Complex NumbersTwo Days
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Solve the following quadratic:
Warm-up
042 x
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The Imaginary Unit (i) has the following properties.
The imaginary number i is defined as the number whose square is -1. That is:
Imaginary Numbers are of the form a + bi where b ≠ 0.
Complex Numbers are of the form a + bi where a and b are Real Numbers.
Imaginary Numbers
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We can add and subtract imaginary numbers similar to how we add and subtract terms with variables. Think “like terms.”
Addition of Imaginary Numbers
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Similarly, we can multiply imaginary numbers following the same exponent rules we use for variables.
Multiplying Imaginary Numbers
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The absolute value of a complex number is the distance the number lies from the origin in the complex plane.
Think Pythagorean Thm..
Absolute Value of Complex Numbers
22 babia
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Larger powers of i can be simplified by dividing the power by 4 and using the remainder to determine the appropriate value.
Powers of i
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Solve:
Finding Complex Solutions
02005 2 x
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Pg 278 (# 1-45 odd)
Homework
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If z = a + bi is an imaginary number, the its conjugate is z = a – bi.
Complex Conjugates can be used to eliminate imaginary numbers from the denominators of fractions. This is very similar to how we rationalize denominators.
Complex Conjugates
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Eliminate the Imaginary numbers from the denominator in the following example.
Using Complex Conjugates
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Practice 5-6 WS (even)
Homework
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Completing the Square and the Quadratic Formula
Two Days
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Perfect Square Trinomials
Examplesx2 + 6x + 9x2 - 10x + 25x2 + 12x + 36
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Creating a Perfect Square Trinomial
In the following perfect square trinomial, the constant term is missing. X2 + 14x + ____
Find the constant term by squaring half the coefficient of the linear term.
(14/2)2
X2 + 14x + 49
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Solve for x..
02 cbxax
a
acbbx
2
4 :Formula Quardatic
2
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Solve the following using the quadratic formula:
Using the Quadratic Formula
0562 xx
0932 2 xx
What do we notice about these two problems? How else could we Have solved these quadratics?
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Solve the following quadratics:
Using the Quadratic Formula
05103 2 xx
01043 2 xx
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pg 293 (# 1-29 odd)
Homework
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Quadratic Formula and the Discriminant
1 Day
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THE QUADRATIC FORMULA
1. When you solve using completing the square on the general formula you get:
2. This is the quadratic formula!3. Just identify a, b, and c then substitute
into the formula.
2 4
2
b b acx
a
2 0ax bx c
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WHY USE THE QUADRATIC FORMULA?
The quadratic formula allows you to
solve ANY quadratic equation, even
if you cannot factor it.
An important piece of the quadratic
formula is what’s under the radical:
b2 – 4ac
This piece is called the discriminant.
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WHY IS THE DISCRIMINANT IMPORTANT?
The discriminant tells you the number and types of
answers
(roots) you will get. The discriminant can be +, –, or 0
which actually tells you a lot! Since the discriminant is
under a radical, think about what it means if you have a
positive or negative number or 0 under the radical.
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WHAT THE DISCRIMINANT TELLS YOU!
Value of the Discriminant
Nature of the Solutions
Negative 2 imaginary solutions
Zero 1 Real Solution
Positive – perfect square
2 Reals- Rational
Positive – non-perfect square
2 Reals- Irrational
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Use the discriminant to determine the type and number of roots.
0542 xx
0282 2 xx
0526 2 xx
036122 xx
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Pg 293 (#31-39 odd) Practice 5-8 WS (#2-26 even)
Quiz 5.8 on 11/18!!
Homework
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5.1 Modeling with Quadratics
1 Day
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The standard form of a quadratic is
Standard Form of a Quadratic
erm.constant t theis
and m,linear ter theis
term,quadratic theis
: where2
2
c
bx
ax
cbxaxy
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The graph of a quadratic function is called a parabola.
The axis of symmetry is the vertical line that divides the parabola into two identical halves and is written x=a.
The vertex (a,b) of the parabola is the point at which the parabola intersects the axis of symmetry and is also a maximum or minimum point of the function.
Parabolas
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Given 3 points on the function we can determine the equation of the quadratic.
Writing Equations of Quadratics
function. on the points are 10)(3, and 3),(2, (1,0),
: where Find 2
cbxaxy
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pg. 241 (#1-12 all, 21)
Homework
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5.2 Graphing Parabola4 Days
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5.3 Transforming Parabolas
3 Days
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Standard form of a Quadratic:
Vertex form of a Quadratic:
Quadratic Functions
0 ; 2 acbxaxy
),( :Vertex ; )( 2 khkhxay
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Competing the Square
463 2 xxy
4) 2(3 2 xxy222 )1(34))1( 2(3 xxy
3a (-1,-7),:Vertex 7)1(3 2 xy
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