Question

if x+y=1/9 and xy=1/20, find the value of x²+y²?​

Answer 1

x²+y²= 61 / 1620

Step-by-step explanation:

(x+y)²=x²+y²+xy

(1/9)²=x²+y²+1/20

1/81 - 1/20 =x²+y²

20-81/1620 =x²+y²

x²+y²= 61 / 1620

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Answer 2

x²+y²

=x²+y²+2xy-2xy

=(x+y)²-2xy

=(1/9)²-2×1/20

=1/81-0.1

=0.012-0.1

= -0.98

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