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f"(x) = 2
f'(x) = 2x + c
f'(-2) = 0
f'(-2) = 2(-2) + c = 0
-4 + c = 0
c = 4
f'(x) = 2x + 4
f(x) = x² + 4x + c
f(-2) = 14
f(-2) = (-2)² + 4(-2) + c = 14
4 - 8 + c = 14
-4 + c = 14
c= 18
maka f(x) = x² + 4x + 18