SOLUTION: the length of a rectangle is 40 cm longer than i ts breadth. if the area of the rectangle is 1200 cm2 , calculate the length of the rectangle

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Question 1073770: the length of a rectangle is 40 cm longer than i ts breadth. if the area of the rectangle is 1200 cm2 , calculate the length of the rectangle
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
L=40%2BB
B=L-40
and
L%2AB=1200
L%2A%28L-40%29=1200
L%5E2-40L-1200=0
%28L-60%29%28L%2B20%29=0
Only positive solutions make sense here.
L-60=0
L=60cm
Now use either equation to find B.