Question

if x+y=9,xy=40 find the value of x²+y²​

Answer 1

Answer:

1

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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