Question

me ajudem pfv(×+8)²=9​

Answer 1

(×+8)²=9

(x+8) =√9

(x+8) = ±3

=> x+8= +3 => x'=3-8= -5 ✓

=> x+8= -3 => x'=-3-8= -11 ✓

Answer 2

(×+8)²=9

(×+8).(×+8)=9

ײ+8×+8×+64=9

ײ+16×+64-9=0

ײ+16×+55=0

Formou-se uma equação do 2°grau. Vou resolvê-la:

∆=16²-4.1.55

∆=256-220

∆=36

×=-16±6/2

×'=-16+6/2=-10/2=-5

×"=-16-6/2=-22/2=-11

S={-5,-11}