If x-y = 7 and xy = 9, then the value of x²+ y² is?
Answers
Answered by
92
(x-y) = 7
Squaring both sides,
(x-y)^2 = 49
x^2 + y^2 - 2xy = 49
x^2 + y^2 = 49 + 2xy = 49+2*9 = 49+18 = 67.
Hope this helps you!
Squaring both sides,
(x-y)^2 = 49
x^2 + y^2 - 2xy = 49
x^2 + y^2 = 49 + 2xy = 49+2*9 = 49+18 = 67.
Hope this helps you!
Answered by
31
Answer:
Step-by-step explanation:
x-y=(7)^2
(a+b)^2 formula has been written
x^2+y^2-2xy=49
x^2+y^2=49+2×9=67
So that's it
Thank you
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