Question

If xy = 9 and x + y = 10,then x
2 + y
2 = ____________

Answer 1

Answer:

82

Step-by-step explanation:

x+y = 10

xy = 9

x² + y² = ??

x² + y² = (x + y)² - 2xy

           = (10)² - 2*9

           = 100 - 18

           = 82

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