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Simplify this equation, factor it and solve for x. You will get two values for x but one of them will be negative. The width of a rectangle can't be negative so only the positive value makes sense. Penny
Hi Julie. The area of a rectangle is the width times the length, so 400 = x (2x7). Multiply it: 2x^{2}  7x = 400 Complete the square: 2 ( x  (7/4) )^{2} = 3249 / 8 You finish it and find out what x equals. Cheers,  


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