Question

plz answer my question fast ​

Answer 1

Answer:

(B) 6

Step-by-step explanation:

x²+y²+2xy=13+2xy

(x+y)²=13+2xy

(5)²=13+2xy

25-13=2xy

12/2=xy

xy=6

Answer 2

Answer:

6

Step-by-step explanation:

Given:

• x+y=5                                   - Equation (i)
• x^{2} + y^{2}  = 13                 - Equation (ii)

Now,

Squaring both sides in Equation (i)

(x+y)^{2}  = (5)^{2}

=> x^{2} + y^{2} +2xy = 25            -Equation (iii)

We know from Equation (ii) that x^{2} + y^{2}  = 13

From equation (ii) and (iii)

=>13+ 2xy = 25

=> 2xy = 25-13

=> xy = 12/2

=> xy = 2

Therefore the value of xy is 6.