exam Maths Puzzle Numerical Ability

Please explain and show me how to solve this promblem. That way I don't need to ask again.Thanks!

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exam Other Question
I am lost on this one
anybody help please

given f(x)=3x^2-7x+2 and g(x)=4x-3, find (f-g)(5)

thanks 7cos(2*x)+sin(x)=7 [0, 2pi]
4sin(2*x)+cos(2*x)=0 [0, 2pi]
cos(2*x)-sin(x)=0 [0, 2pi]