length of a rectangle is thrice its breath.if it L is decreased by 10cm & b is increased by 5cm.the area of rectangle is increased by 150cm2.then the L of rectangle is.....
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Answered by
2
l=3b
(3b-10)(b+5)=(3b×b)+150
3b^2+15b-10b-50=3b^2+50
5b=100
b=20
l=60
(3b-10)(b+5)=(3b×b)+150
3b^2+15b-10b-50=3b^2+50
5b=100
b=20
l=60
Answered by
0
l=3B,(3B-10) (B+5) =lB+150
3B^2 - 150=3B^2 +5B-50
5B=100
B=20
l=3B, l=3×20, l=60
3B^2 - 150=3B^2 +5B-50
5B=100
B=20
l=3B, l=3×20, l=60
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