exam Maths Puzzle Numerical Ability

My problem is if the vertex of f(x)=x^2+bx+c is at (2,4), find b and c.

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exam Other Question

how can u teach me about triangles angles Simplify: (3x^3 -9x -3) / (3x+3)

the possible answers are:
x^2 - x - 2 remainder 3
x^2 - 4x remainder -15
x^2 - 4x remainder 9
x^2 - x 0 2 remainder -9