Question

Mim ajude nesse conta por favor retribuir (x+3). (x+1)=15

Answer 1

(x+3).(x+1)=15

x²+x+3x+3=15

x²+4x=15-3

x²+4x=12

x²+4x-12=0

delta = 4² - 4.1.-12

16 - 4. -12

16 + 48

64

-4+-8/2

-4+8/2 = 2

-4-8/2 = -6

x = 2 ou x = -6

Answer 2

Boa tarde

(x + 3) * (x + 1) = 15

x² + 3x + x + 3 = 15
x² + 4x - 12 = 0

x² + 4x = 12
x² + 4x + 4 = 12 + 4
(x + 2)² = 16

x1 + 2 = 4
x1 = 2

x2 + 2 = -4
x2 = -6