exam Maths Puzzle Numerical Ability

Factor: 12y^3 + 16y^2 - 3y - 4

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I need help finding the zeros of the function algebraically.
f(x)=2x2-7x-30 An astronaut standing on the surface of the moon throws a rock upward. The height of the rock is given by s=-2.7t^2+27t+6.3, where s is the height in metres and t is the time in seconds.What was the initial height of the rock?