exam Maths Puzzle Numerical Ability

Given f(x)=5x+7 and g(x)=x^2+7, find (g f)(x).

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exam Other Question

my worksheet says to simplify this problem, could you please help me? thank you

5x^1/3(6x^2/3 -x^-1/3) if f(x)=2x^-2 and g(x)= 3+x^2, find the rule of the function-3(f*g)(x)