book Maths Puzzle Numerical Ability

FIND THE ZEROS

x^2+2x-63=y

x^2-x-72=y

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book Other Question

If the first side of a triangle is 3/4x, the second side is 1/x^2 and the third side is 5/x^2, find an expression that represents its perimeter. What is the square root of x^3?