exam Maths Puzzle Numerical Ability

solve the equation

|x^2+2x-36|=12

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exam Other Question

One side of a triangle is four centimeters longer than the shortest side. The third side of the triangle is twice as long as the shortest side. Find the length of all the sides if the perimeter is 40 centimeters. Given f(x) and g(x), determine and simplify f[g(x)]
f(x) = 1-x^2/x, g(x) = sq. rt. of 1+x

I really have trouble with these types of functions. Any help you can give would be