Question

X + Y is equal to 3, if X + Y is equal to 3 X square + Y square is equal to 5 then xy is equal to ​

Answer 1

Step-by-step explanation:

Given: x+y =3. --1eq.

3x^2 + y^2 = 5 --2eq.

Solution: x = 3-y

putting value of x in 2 eq.

3(3-y)^2 + y^2 = 5

3(9 + y^2 + 6y) +y^2 =5

27 +3y^2 + 6y +y^2 = 5

4y^2 +6y +27 - 5= 0

4y^2 +6y +22= 0

2(2y^2 + 3y + 11) =0

2y^2 + 3y + 11= 0

now you can solve it by discrimination method