Question

a) x² + x = -1

b) x² = -x

Answer 1

a)x²+x=-1
x²+x+1=0
a=1 b=1 c=1
∆=1-4.1.1
∆=1-4
∆=-3
Não possui raiz real

b)x²=-x
x²+x=0
a=1 b=1 c=0
∆=1-4.1.0
∆=1-0
∆=1
x=-1+-√1/ 2
x=-1+-1/ 2
x'=-1+1/ 2
x'=0/2
x'=2
x"=-1-1/ 2
x"=-2/ 2
x"=-1