If x+ y = 21 and …
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Posted by Shri Niwas Jat 7 years, 2 months ago
- 1 answers
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Naveen Sharma 7 years, 2 months ago
Ans. x + y = 21 ......(1)
xy = 80 .....(2)
From (1)
x = 21-y
(21-y)×y = 80
=> 21y - y2 = 80
=> y2 -21y +80 = 0
=> y2 -16y -5y +80=0
=> y(y-16)-5(y-16) = 0
=> (y-16)(y-5) = 0
=> y = 16 or y = 5
If y =16 then x = 5
If y =5 then x =16
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