The perimeter of a rectangular region is 72m and its area is 315 m square . Find its length .
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Step-by-step explanation:
Given That, perimeter of rectangular region=72m
=>2(l+b)=72m
=>l+b=36m
=>l=36m-b---------------------(1)
Also, Area of rectangular region=315m²
=>l×b=315m²
=>(36m-b)b=315m²
=>36mb-b²=315m²
=>b²=36mb-315m²
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