Question

18. If x + y = 3,x^2 + y^2 = 5 then xy is?
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Answer 1

Answer:

xy = 2

Step-by-step explanation:

Given,

x+y=3

x²+y²=5

xy=?

We know that,

(a+b)²= a²+b²+2ab

(x+y)²=x²+y²+2xy

3² = 5 +2xy

9 = 5 + 2xy

2xy= 4

xy = 2

Hope it helps...

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