exam Maths Puzzle Numerical Ability

I need help to perform the given operation

f(x)=2x2-13x+15, g(x)=3x+4

I need to find (f+g)(-1)

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exam Other Question

Geometry. If the sides of a square are decreased by 2 cm, the area is decreased by 36 cm2. What were the dimensions of the original square?

thanks. 1/250=1/2,000,000+1/1

The image distance of i for an object that is 2,000,000 mm from a 250-mm telephoto lens.

Using the formula 1/f=1/0+1/t