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**Warm-Up DEGREE is Even/Odd, LEADING COEFFICIENT is Positive/Negative,**

END BEHAVIOR EXTREMA (Max or Min, Relative or Absolute) (-2, 15) [1] [2] (8, 9) (-3, 4) (-9, -8) (7, -21) [3] [4]

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**Factoring Polynomials Review:**

[1] Difference of SQUARES Example [2] Difference of CUBES Example [3] Sum of CUBES Example

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**[4] Factoring Trinomials:**

ax2 + bx + c Example Step #1: Find the factor pair (n1 and n2) that MULTIPLY = ac (outsides) and ADD = b (middle). Step #2: Split the middle term bx = n1x + n2x Step #3: Perform factor by grouping on ax2 + n1x + n2x + c GCF of ax2 + n1x and GCF n2x + c = (?x + ?) (?x + ?) Multiply = -12| Add = -4 -6 * 2 = 12; = -4

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**Factoring Polynomials: PRACTICE**

b) c) d) e) f)

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**U – SUBSTITUTION: u = xn ax2n + bxn + c = 0 au2 + bu + c = 0**

Step #1: Must have a trinomial in which one power of x is DOUBLE the other. ax2n + bxn + c = 0 Step #2: Let u equal smaller exponent of x u = xn Step #3: SUBSTITUTE u into the trinomial to create a quadratic equation. au2 + bu + c = 0 Step #4: Use FACTORING or QUADRATIC FORMULA to find roots for u and solve for xn. u = Root #1 and u = Root #2 xn = Root #1 and Root #2

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**x4 – 16x2 + 60 = 0 EXAMPLE of U – SUBSTITUTION:**

Step #1: x4 is double the x2 exponent Step #2: u = x2 Step #3: u2 – 16u +60 = 0 Step #4: Solve u2 – 16u +60 = 0 Factoring: (u – 10)(u – 6)=0 Roots: u = 10 and u = 6 x2=10 and x2=6 Solve for x:

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**Example 1: Quadratic Form Only**

If possible, identify the variable term for u and write each equation in quadratic form using U-SUBSTITUTION. a) 2x6 + x3 + 9 = 0 b) x4 + 2x = 0 c) 7x10 – 6 = 0 d) x7 + 2x = 0 f) e)

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**Example 2: Solve using U-SUBSTITUTION**

Check to factor substituted quadratic form. b) a)

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**Example 2: U-Substitution Part 2**

Check to factor substituted quadratic form. c) d)

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**Example 2: U-Substitution Part 3**

Check to factor substituted quadratic form. f) e)

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**Example 2: U-Substitution Part 4**

Check to factor substituted quadratic form. g) h) i) j)

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**Example 3: Solving Equations of Perfect Cubes**

Factor and Apply Quadratic Formula b) a) c) d)

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