if x+y=9,xy=40 find the value of x²+y²
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Step-by-step explanation:
x+y = 9
xy = 40
(x+y)^2 = x^2+ y^2+ 2xy
=> 9^2 = x^2+ y^2 +2× 40
=> 81 = x^2+ y^2+ 80
=> 81- 80= x^2+ y^2
=> 1 = x^2+ y^2
=> x^2+ y^2 = 1
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