exam Maths Puzzle Numerical Ability

f(x) = x^2-x-2; find (a) f(0) (b) f(-2) and (c) f(1)

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I just need help setting up the problem, from there I think I can do it.
Thanks. The vertices of a triangle are P (-1,-1) Q(2,1) and R (3,-1). Find the equation of the altitude of the triangle PQR from Q.