book Maths Puzzle Numerical Ability

Find x if Xsquared= 2x+5

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At the site of the old millstone, a triangle. Two sides: 15 and 10 yards; 30 degree angle opposite the 10-yard side: corner located at the center of the millstone. Third side: due How do I simplify -x^2 / (-x^2)^2y^2 ?