exam Maths Puzzle Numerical Ability

3. Simplify:
√[81x12y8z10

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exam Other Question

I do not understand how to work this problem: y=x^3-8x. I know that the y-intercept is (0,0), but I can not figure out how to find the x-intercepts. divide

x2 - 9x + 20 ÷ x2 - 25
------------ ÷ ---------
6x - 4 ÷ 2x + 10

I am totaly stumped, please help!!!