exam Maths Puzzle Numerical Ability

4x^2-20x+3/2x+1 + 2x^2-25x-27/4x+2
Okay, I can do this one, I just wanted to make sure my LCD was right
LCD=4x+2

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5x^2 + 2x - 4, x^2 - 2x -3, and 2x^2 - 4x - 3 find the dimensions of the rectangle. if its length is twice its width. perimeter is equal to 208.