x=−418
x=−14
x=14
x=418
Correct answer is B
The line of symmetry of the curve is at the minimum point of the curve (ie y' = 0)
ddx(5−x−2x2) = -1 - 4x
If y' = 0, we have −1−4x=0⟹4x=−1
x=−14
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