exam Maths Puzzle Numerical Ability

Please help me solve this equation (5x^2+7x+8)-(2x^2+3x+4)

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exam Other Question

Choose values of x, then simplify it correctly.
10x^2-30x+20/x^2-1
I did something wrong on that one, maybe someone could show me how it works. (2x3y-2/3y-3)3