Question

resolva a equacao

X elevado a 2 + 2x = 15

Answer 1

Resposta:

$x^{2}$+2x=15

$x^{2}$+2x-15=0

(x-3).(x+5)=0 (produto de stevin)

x=3 ou x=-5

Answer 2

x²+2x=15

x²+2x = 16 -1

x²+2x+1 = 16

(x+1)² = 16

x+1=±4↓

x+1=+4 => x'=3

x+1= -4 => x"= -5