Question

X+y = -13 and XY =40 find X square + y Square

Answer 1

Answer:

let X+Y=-13 equation first and XY=40 equation 2

Step-by-step explanation:

sguaring both sides of equation X+y=-13 we get,

x^2+y^2+2xy= 169 put the value of XY in this equation we get , xSquare + ysqare +2(40) = 169 then ,

Xsquare+ Y square= 169-80

so,

X^2+Y^2 = 89