exam Maths Puzzle Numerical Ability

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

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exam Other Question

Have I rounded this correctly. I am supposed to round to the nearest tenth. The number is 75.982 I have 76.0. is this correct? This gets confusing for me and I thank you for your time and help. create a graph that shows f(x)=3x+2