Math, asked by khansaad37500, 7 months ago

if X + y = 9 and xy= 21 find the value of x ² + y ²

Answers

Answered by sumaiya298

1

Answer:

39

Step-by-step explanation:

x+y=9

(x+y)²=81

x²+y²+2xy=81

x²+y²+2(21)=81

x²+y²=81-42= 39

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