exam Maths Puzzle Numerical Ability

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.

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exam Other Question

write the equation of the line L. satisfying each of the following sets of geometric conditions. L passes through (5,6) and is perpendicular to 3x-5y=15

L has y-intercept(0,-3) and is paralell to -3x+5y=-15 Please help me solve this equation (5x^2+7x+8)-(2x^2+3x+4)