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Frankie Abbott
Mathematics
18 November, 17:15
Write x2 + 4x - 2 in vertex form.
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Emilee Rivers
18 November, 17:21
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The vertex form: y = a (x - h) ² + k
y = ax² + bx + c then h = - b/2a and k = f (h).
y = x² + 4x - 2
a = 1; b = 4; c = - 2
h = - 4 / (2·1) = - 4/2 = - 2
k = f (-2) = (-2) ² + 4· (-2) - 2 = 4 - 8 - 2 = - 6
Answer: y = (x + 2) ² - 6.
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