Question

2x elevado a 2 mais x menos 1 igual a zero

Answer 1

2x²+x-1=0
a=2 b=1 c=-1
∆=b²-4.a.c
∆=1+8
∆=9
x=-b±√∆/2.a
x=-1±3/4
x'=1+3/4 x'=1
x"=1-3/4 x"=-1/2