exam Maths Puzzle Numerical Ability

x to the 2nd + 7x + x to the 2nd - 4x
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x to the 2nd - 5x x to the 2nd - 5x

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exam Other Question

Write the quotient

(4x^3+4x^2-4)/(x-2)
and
(2x^3+x^2-x+4)/(2x-5)

Thanks for the help in advance! the length of a leg of a right triangle is two times the length of the other, and the hypotenuse is 25.What is the length of the longer leg?