find the value of x+y when x2+y²=25 and xy= 12
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since ,
xy = 12
and , x² + y² = 25
we know that ,
(x + y)² = x² + y² + 2xy
=> (x + y)² = 25 + 2 × 12
=> (x + y)² = 25 + 24
=> (x + y)² = 49
=> x + y = √49
=> x + y = 7 .... answer
xy = 12
and , x² + y² = 25
we know that ,
(x + y)² = x² + y² + 2xy
=> (x + y)² = 25 + 2 × 12
=> (x + y)² = 25 + 24
=> (x + y)² = 49
=> x + y = √49
=> x + y = 7 .... answer
thanks!
wlcm :)
it may be -ve??
yeah , but generally we write it positive
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