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Complete the Square to Reveal Structure
Grade Level
Praxis Core
5165.031 Complete the Square to Reveal Structure
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For the quadratic f(x) = 12x
2
– 18x + 7, which vertex-form rewrite reveals the correct vertex?
A
f(x) = 12(x + 3/4)
2
+ 1/4; vertex (-3/4, 1/4)
B
f(x) = 12(x - 3/4)
2
+ 1/4; vertex (3/4, 1/4)
C
f(x) = 12(x - 3/4)
2
- 1/4; vertex (3/4, -1/4)
D
f(x) = 12(x + 3/4)
2
- 1/4; vertex (-3/4, -1/4)
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