Question

If x2+y2=90 if x. y=5 then find value of x+y

Answer 1

Hello !!
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Given :

x² + y² = 90

xy = 5

THEN !

( x + y )² = x² + y² + 2xy

( x + y )² = 90 + 2 × 5

( x + y )² = 100

x + y = 10

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Thanq :)