Question

considerando que x2 - y2 = 24 e x + y = 12, qual o valor de x - y?

Answer 1

x+y=12
x=12-y
1(12-y)²-y²=24
(12-y)(12-y)-y²=24
144-12y-12y+y²-y²=24
-24y=24-144
-24y=120
y=120/-24
y=-5

x+1(-5)=12
x-5=12
x=12-5
x=7

O valor do X=7 E Y=-5
A pergunta eh "x-y"
7-5=2