PQRS is a rectangle.PQ+QR=7 and the area is 12 then PR=
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PQ+QR=7............(1)
pq=7-qr.
put in (2)
pq×qr=12.............(2)
(7-qr)(qr)=12
7qr-q²r²-12=0
q²r²-7qr+12=0. taking(-) common
q²r²-4qr-3qr+12=0
qr(qr-4)-3(qr-4)
(qr-4)(qr-3).
qr=3,4cm
As qr=pr
PR=3,4
pq=7-qr.
put in (2)
pq×qr=12.............(2)
(7-qr)(qr)=12
7qr-q²r²-12=0
q²r²-7qr+12=0. taking(-) common
q²r²-4qr-3qr+12=0
qr(qr-4)-3(qr-4)
(qr-4)(qr-3).
qr=3,4cm
As qr=pr
PR=3,4
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