Question

como resolver x²+2(x+1)=5​

Answer 1

Boa noite!

x² + 2(x +1) = 5

x² + 2x + 2 = 5

x² +2x +2 -5 = 0

x² + 2x - 3 = 0

a= 1

b= 2

c= -3

∆ = b² -4.a.c

∆ = 2² - 4. 1. (-3)

∆= 4 + 12

∆= 16

x= -b±√∆ / 2.a

x' = -2 +√16 /2

x' = -2 + 4 /2

x' = 2/2

x' = 1

x" = -2 -4/2

x" = -6/2

x" = -3

S = { -3 , 1}

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