if x minus y = 7 and xy = 9 find the value of x square plus y square
Answers
Answered by
45
x-y=7 then x=7+y if xy=9 then (7+y)y=9 then y^2+7y=9 then y^2+7y-9=0 then by solving the equation we will get value of x and y
Answered by
161
x-y=7
xy= 9
As we know that
(x-y)²= x²+y²-2xy
7²+2*9= x²+y²
49+18= x²+y²
67= x²+y²
xy= 9
As we know that
(x-y)²= x²+y²-2xy
7²+2*9= x²+y²
49+18= x²+y²
67= x²+y²
Similar questions