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A square and rectangle have the same area. The length of the rectangle is five inches more than twice the length of the side of the square. The width of the rectangle is 6 inches less than the side of the square. Find the length of the side of the square.

Sagot :

let's say that the side of the square is x. so the length of the rectangle is 2x+5 and the width is x-6. the area for squares and rectangles is a=bh and since the areas are the same we can equal the two areas to get to get ×^2=(2×+5)(×-6) after foiling you get x^2= 2×^2-7×-30 then subtract x^2 to both sides to get. 0=×^2-7×-30 so x = 3 and -10. because you can't have a negative side, the length of the side of the square is 3in.
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