Question

If x - y = 3, x² + y² = 5 then xy is *

Answer 1

Answer:

xy=-2

Step-by-step explanation:

x - y = 3

x² + y² = 5

WE KNOW THAT:

(x-y)^2=x² - 2xy + y²

substitute the given values

(3)^2=5-2xy

9=5-2xy

9-5=-2xy

4=-2xy

4/-2=xy

-2=xy

xy=-2

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Answer 2

Answer:

-2

Step-by-step explanation:

(x-y)² = x² - 2xy + y²

3² = 5 - 2xy

9 = 5 - 2xy

9 - 5 = - 2xy

4 = -2xy

4/ -2 = xy

xy = -2