Question

If x - y = 7 and xy = 9 . Find the value of (x sq + y sq)


Answer fast​

Answer 1

$→ x-y= 7$

$→ (x-y)²=7²$

$→ x²+y²-2xy=49$

$→ x²+y²-2×9=49$

$→ x²+y²-18=49$

$→ x²+y²=49+18$

$→ x²+y²=67$

Answer 2

Given (x - y) = 7 and xy = 9

x - y = 7

On squaring both sides, we get,

(x - y)² = (7)²

x² + y² - 2xy = 49

x² + y² - 2(9) = 49

x² + y² - 18 = 49

x² + y² = 49 + 18

x² + y² = 67