exam Maths Puzzle Numerical Ability

If f(x) = 2x + 5 and g(x)= x^2 - 3x, find g(-3)

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exam Other Question

The sum of the reciprocals of two consecutive integers is 7/12. Find the two integers. Given f(x)=3^x, which statement is true?
a) f(x+y)=f(x)+(y)
b) f(x+y)=f(x)f(y)
c) f(xy)=f(x)+f(y)
d) f(x/y)=f(x-y)