What is the vertex?
f(x) = -x2 - 4x + 12.

vertex = (- 2, 16 )

Step-by-step explanation:

Given a quadratic in standard form : f(x) = ax² + bx + c ( a ≠ 0 )

Then the x- coordinate of the vertex is

= -

f(x) = - x² - 4x + 12 ← is in standard form

with a = - 1, b = - 4, thus

= - = - 2

To find the y- coordinate substitute x = - 2 into f(x)

f(- 2) = - (- 2)² - 4(- 2) + 12 = - 4 + 8 + 12 = 16

Vertex = (- 2, 16 )

answer:   14

step-by-step explanation:          

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step-by-step explanation: