Question

a rectangle is to be made with perimeter 80 metre and area 396 square metres. what should be the length of it's sides? ​

Answer 1

Answer:

18 or 22 m

Step-by-step explanation:

P=2(l+b)

or,80=2(l+b)

or,40-l=b

A=l×b

or,396=l×b

or,396/l=b

equating both b,

40-l=396/l

or,40l-l²-396=0

or,-l²+40l-396=0

or,l²-40l+396=0

or,l²-(22+18)l+396=0

or,ĺ²-22l-18l+396=0

or,l(l-22)-18(l-22)=0

or,(l-18)(l-22)=0

either,l-18=0 or,l-22=0

#l=18m or , 22m

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