the length of a rectangle is 7m more than its breadth if the length is decrese by 10m and breadth is decreased by3m,then the area is decreased by 108m find the length and breadth of rectangle
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L=b+7
Therfore area=b(b+7)
=b²+7b
New l=b-3
And new b=b-3
Area=(b-3)(b-3)=b²-6b+9
Then new area=lb-108
Now
B²+6b+9=b²+7b-108
7b-6b=108+9
B=117
And L=B+7=117+7=124
Therfore area=b(b+7)
=b²+7b
New l=b-3
And new b=b-3
Area=(b-3)(b-3)=b²-6b+9
Then new area=lb-108
Now
B²+6b+9=b²+7b-108
7b-6b=108+9
B=117
And L=B+7=117+7=124
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the answer is 124.....
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