math
posted by kajul .
A square and a rectangle have equal areas. The length of the rectangle is 9 cm longer than the side of the square and the width of the recangle is 6 cm shorter than the side of the square. How long is the side of the square?

side of square  x
area of square = x^2
length of rectangle = +9
width of rectangle = x6
area of rectangle = (x+9)(x6)
It says the areas are equal
so solve
(x+9)(x6) = x^2
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