Lesson 9.3: The Quadratic Formula

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• B
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• D

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CCSS.HSA.APR.B.3

CCSS.HSA.REI.B.4

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• B
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CCSS.HSA.APR.B.3

CCSS.HSA.REI.B.4

Determine the values of
a, b, and c for
the quadratic equation: 
4x² – 8x = 3

• a = 4, b = -8, c = 3
• a = 4, b =-8, c =-3
• a = 4, b = 8, c = 3
• a = 4, b = 8, c = -3

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• B
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• D

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CCSS.HSA.APR.B.3

CCSS.HSA.REI.B.4

What is this formula?

• This is the speed of light formula.
• This is the quadratic formula.
• This is the zero product property.
• This is scary.

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CCSS.HSA.REI.B.4

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

• Get factored form
• Write down: a=1, b=6, c=-13
• Make it equal 0 by subtracting 3 on each side
• Type it all in a calculator.

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CCSS.HSA.REI.A.1

CCSS.HSA.REI.B.4

Solve     8x² - 6x + 1 = 0

• No Solution
• 0 or 1
• -0.5 or -0.25
• 0.25 or 0.5

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CCSS.HSA.APR.B.3

CCSS.HSA.REI.B.4

Solve
(x+3)²-5 = 9

• -3±√14
• 3±√14
• ±11
• ±5

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CCSS.HSA.REI.B.4