Question

5. If x+y= 3, x²+y² = 5, then xy is what?
(a)1
(b)2
(0)3
(d)5
MCQ'S​

Answer 1

GIVEN :

x+y= 3

x² + y² = 5

xy = ?

We have to find the value of xy, then we should use the formula of (x+y)² = x² + y² + 2xy

Substitute the value in the identity.

(x+y)² = x² + y² + 2xy

(3)² = 5 + 2xy

9 = 5 + 2xy

2xy = 9 - 5

2xy = 4

xy = 4/2

xy = 2

Therefore, the value of xy is 2.

Answer 2

Answer :

5. If x+y= 3, x²+y² = 5, then xy is what?

(a)1

(b)2

(c)3

(d)5

IN THIS QUESTION,

GIVEN :

x+y= 3

x² + y² = 5

xy = ?

We have to find the value of xy, then we should use the formula of (x+y)² = x² + y² + 2xy

Substitute the value in the identity.

(x+y)² = x² + y² + 2xy

(3)² = 5 + 2xy

9 = 5 + 2xy

2xy = 9 - 5

2xy = 4

xy = 4/2

xy = 2

Therefore, the value of xy is 2.

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