Question

Given that x² + y2 = 15 and xy = 2 Find the value of
(x-y)²?
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Answer 1

11

Explanation:

(x-y)²=x²+y²-2(xy)

Given : x²+y²=15

xy=2

By substituting we get ,

(x-y)²=15-2(2)

(x-y)²=15-4

(x-y)²=11

Answer 2

11

Explanation:

(x - y)² = x² - 2xy + y² = x² + y² - 2xy = 15 - 2(2) = 15 - 4 = 11