The curve y = ax ^(3) + bx ^(2) + cx + 5...

The curve `y = ax ^(3) + bx ^(2) + cx + 5` touches the x-axis at `P (-2, 0)` and cuts the y-axis at a point Q where its gradient is 3, then `2a + 4b ` is equal to :

A

`-1/2,-3/4,3`

B

`3,1/2,-3/4`

C

`-3/4,-1/2,3`

D

none

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The correct Answer is:

A

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