exam Maths Puzzle Numerical Ability

create a graph that shows f(x)=3x+2

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exam Other Question

I've been giving the following problem:

If 2f(x)+f(1-x)=x^2 find f(x)

The answer was given as:

1/3x^2+2/3x-1/3

I need to know how this answer came about. I have two Can you help me find GCF of the following product.

(6y^2 - 3y)(y + 7)

Thank you so much for your time.