Question

If x² + y2 = 14 and xy = 3
,
then find the value of
2(x + y)2 - 5(x - y)​

Answer 1

Answer:

I don't know whether it's correct or not

Step-by-step explanation:

x^2 + y^2 = 14

(x+y)^2 = x^2 + y^2 + 2xy

= 14+2(3)

= 20

(x-y)^2 = x^2 + y^2 - 2xy

= 14 - 2(3)

= 8

2(x + y)2 - 5(x - y) =

2(20) - 5(root8) = 40 - 5 root8