8.6 Factoring to Solve Quadratic Functions

Solve by factoring: x² + 3x - 18 = 0

• x = -3 and x = 6

• x = 3 and x = -6

• x = -9 and x = 2

• x = 9 and x = -2

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CCSS.HSA-REI.B.4B

Given the points (0,5), (1,6), (2,9), (3,14), and (4,21), write the equation that represents the function.

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CCSS.8.F.A.1

CCSS.HSF.IF.A.1

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CCSS.HSA-REI.B.4B

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CCSS.HSA-REI.B.4B

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CCSS.HSA-REI.B.4B

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CCSS.HSA-REI.B.4B

• x = - 4 and x = - 5

• x = 20 and x = - 9

• x = 4 and x = 5

• x = - 4 and x = 5

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CCSS.HSA-REI.B.4B

• x = - 5 or x = - 7

• x = 5 or x = 7

• x = - 35 or x = - 1

• x = - 9 or x = - 4

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CCSS.HSA-REI.B.4B

What should you do first in solving this equation?
x² + 6x - 13 = 3

• Get factored form
• Find two numbers which add to make 6 and multiply to make -13
• Make it equal 0 by subtracting 3 on each side
• Type it all in a calculator.

Tags

CCSS.HSA-REI.B.4B

• x = -1

• x = -1 or x = 1

• x = 1

• x = -2 or x = 5

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CCSS.HSA-REI.B.4B