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3 years ago

Complete the square to write ×²-4x-9 in the form (x+a)² +b(x+ ) ^2+

Mathematics

1 answer:

MariettaO [177]3 years ago

5 0

Answer:

A: (2,5)

B: (-4,-16)

C: (-2.5,-8.25)

Step-by-step explanation:

A. y = x²- 4x + 9

y = x² - 2(x)(2) + 2² - 2² + 9

y = (x - 2)² - 4 + 9

y = (x - 2)² + 5

Vertex: (2,5)

b. f(x) = x² + 8x

f(x) = x² + 2(x)(4) + 4² - 4²

f(x) = (x + 4)² - 16

Vertex: (-4,-16)

c. y = x² + 5x - 2

y = x² + 2(x)(2.5) + 2.5² - 2.5² - 2

y = (x + 2.5)² - 6.25 - 2

y = (x + 2.5)² - 8.25

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