if x-y=7 and xy=9 find the value of x^2+y^2
Answers
Answered by
1
(x-y)^2 = (7)^2 ( SQUARING BOTH SIDES)
X^2 + Y^2 -2XY = 49
X^2 + Y^2 = 49 + 2XY
= 49 + 2(9)
= 49 + 18
= 67
67 is the answer.
X^2 + Y^2 -2XY = 49
X^2 + Y^2 = 49 + 2XY
= 49 + 2(9)
= 49 + 18
= 67
67 is the answer.
Similar questions