1. The curve $C$ has equation $y=a{x}^{3}+b{x}^{2}–12x+6$ where $a$ and $b$ are constants.

The point $A$ with coordinates (2, –6) lies on $C$.

The gradient of the curve at $A$ is 16.

Find the $y$ coordinate of the point on the curve whose $x$ coordinate is 3.

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