exam Maths Puzzle Numerical Ability

Could someone please help me?

Given f(x)=x^2 and g(x)=3x-1, find (f*g)(2) and (g*f)(x)

Any help will be greatly appreciated.

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exam Other Question
How would i solve these using factoring ? .


1- 5x^2 = 2x - 7x^2
2- 3x^2 + 6x = 2x^2 - 9
3- 5x^2 - 11x + 2 = 0 find the area of a rectangle which shows the answer as a polynomial in descending powers of x. length: 4x+5, width: 4x-1