Question

x2-1=x+11 qual e a resposta

Answer 1

x²-1=x+11
x²-x-12=0

Δ=b²-4ac
Δ=1-4.1.(-12)
Δ=1+48=49

x= (-b±√Δ)/2

x=(1±7)/2

x'= 4
x''= -3