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Math
Solodovnikov

3. If x2 + y2 = 99 and xy = 9, find x - y.​

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Answer:

( x - y) = 9

Given :- x^2 + y^2 = 99

xy = 9

we have to find :- ( x - y ) = ?

we know that :- ( x - y )^2 = x^2 + y^2 -2xy

( x- y )^2 = 99 -2(9)

( x - y )^2 = 99 - 18

( x - y )^2 = 81

( x - y ) = 9

Hence ; (x - y ) = 9 !!!!!!!!!

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Lisa Wells
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