Question

Equação do segundo gral
x2-x-2=0 ???

Answer 1

x²-x-2=0
a=1  b= -1  c= -2
Δ=b²-4.a.c
Δ=(-1)² - 4.1.(-2)
Δ=1+8
Δ=9

-b≤√Δ/2.a
-(-1)≤√9/2.1
1+3/2 = 4/2 = 2
1-3/2=2/2=1