rectangle

Area = l x w        and   l = 10w

264 = 10w * w = 10w^2

w^2 = 26.4               (w = sqrt 26.4)            (l = 10 sqrt26.4)

w = 5.138      l = 51.38       

In a certain rectangle, its length is 10 more than its width.  If the area of the rectangle is 264, then what are the dimensions of the rectangle?

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width =>  x         length =>  x + 10

x (x + 10) = 264

x² + 10x - 264 = 0

x = 12

width = 12         length = 22     

12 * 22 = 264