Question

if X + Y is equal to minus 4 and X Y is equal to 2 then find the value
f x square + Y square​

Answer 1

Answer:

⇒ X² + Y² = 12

Step-by-step explanation:

Given :

(X + Y) = -4,

XY = 2,

Find : X² + Y²

Solution :

We know that,

(a + b)² = a² + 2ab + b²

By substituting,

a = X & b = Y,

We get,

(X + Y)² = X² + 2XY + Y²

⇒ (-4)² = X² + 2(2) + Y²

⇒ 16 = X² + Y² + 4

⇒ 16 - 4 = X² + Y²

⇒ X² + Y² = 12

Answer 2

X+ y =-4 - - -(1)

x× y=2

on subtituting we get y=-4-x

X× -4-x=2