book Maths Puzzle Numerical Ability

4x^5 + 10x^4 - 16x^2 divide by 4x^2

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this is a practice problem for a placement test for college. I have the answer but I dont understand how they got it. Help Please! 7x-8(y-x)+3y= 5(3x-y) could someone explain to me how to find the perimeter of a square that has a side measure of 45 cm.Do I multiply 45 x 4? Thanks