Question

if x-y=-23 and xy=-126 then x+y

Answer 1

Step-by-step explanation: $(x-y)^{2}$ = $x^{2}$+$y^{2}$ +2xy

$(-23)^{2}$ = $x^{2}$+$y^{2}$ -2× -126

529 - 252 = $x^{2}$+$y^{2}$

277 = $x^{2}$+$y^{2}$

$(x+y)^{2}$= $x^{2}$+$y^{2}$ + 2xy

$(x+y)^{2}$ = 277 -252

$(x+y)^{2}$ = 25

(x+y) = 5