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

I need help with this problem Add, using the vertical method.
5x^2+2x-4,x^2-2x-3 and 2x^2-4x-3 Please help me! solve the system:
{x+y-4z=6
{2x-5y+3z=2
{x-6y+7z=-4.
i am los