Asked by Sally
A rectangular parking lot is 25 ft. ny 50 ft is increased on all 4 sides by the same amount. The area increased by 400 sq ft. What are the new dimensions of the parking lot?
Answers
Answered by
bobpursley
(25+L)(50+L)=25*50+400
25*50+75L+L^2=25*50+400
L^2+75L-400=0
l=(-75+-sqrt(75^2+1600))/2=(-75+-85)/2=
= 5
new dimensions: 30*55
25*50+75L+L^2=25*50+400
L^2+75L-400=0
l=(-75+-sqrt(75^2+1600))/2=(-75+-85)/2=
= 5
new dimensions: 30*55
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