SOLUTION: if a rectangle is 20 square units and its length is x+4 and width is x-4 what is the dimension of the figure

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Question 468930: if a rectangle is 20 square units and its length is x+4 and width is x-4 what is the dimension of the figure
Answer by Tatiana_Stebko(1539) About Me  (Show Source):
You can put this solution on YOUR website!
The area of the rectangle is A=l%2Aw where l is the length, w is the width of a rectangle
Then %28x%2B4%29%28x-4%29=20
x%5E2-16=20
x%5E2=20%2B16
x%5E2=36
x=6
The length is 6+4=10 inches, the width is 6-4=2 inches
Answer: 6 inches and 2 inches