Math, asked by CRM, 1 year ago

If x - y=7 and xy=9 find the value of x square+ y square

Answers

Answered by gaurav2013c
1
x-y = 7 -------(1)

xy = 9 -------(2)


We know that,

(x-y) ^2 = x^2 + y^2 - 2xy

=> 7^2 = x^2 + y^2 - 2(9)

=> 49 = x^2 +y^2 - 18

=> x^2 + y^2 = 49 + 18

=> x^2 + y^2 = 67

CRM: Thx a lot,very useful
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