What is the vertex form of x² - 4x + 7?
A(x+2)² + 3
B(x-2)² + 3
C(x-2)² + 11
D(x-4)² + 7
Answer & Solution
Correct answer: B. (x-2)² + 3
Completing the square gives x² - 4x + 4 + 3 = (x - 2)² + 3.
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