Question

5 x elevado a 2 + 4x-1=0

Answer 1

Boa noite!

5x²+4x-1=0

a=5    b=4   c= -1

Δ=b²-4*a*c

Δ=4²-4*5* (-1)

Δ=16-20*(-1)

Δ=16+20

Δ=36

x= (-b±∛Δ)/(2a)

x= (-4±∛36)/(2*5)

x= (-4±6)/(20)

x'=(-4+6)/10=2/10=1/5

x''=(-4-6)/10= -10/10= -1