The tangent to the curve y = ax^2 +bx at...

The tangent to the curve `y = ax^2 +bx` at (2, - 8) is parallel to x-axis. Then

A

a = 2, b = -2

B

a = 2, b = -4

C

a = 2, b = -8

D

a = 4, b = -4

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The correct Answer is:

C

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