Question

Resolva as equações do 2° grau, usando a fórmula geral.

a)x²+3x-10=0
b)6x+x-1=0
c)2x²-4x+3=0
d) x²-4x+3=0

Answer 1

∆=b²–4.a.c

a) x²+3x-10=0
a= 1
b= 3
c= -10

∆=3²–4.1.(-10)
∆=9+40
∆=49


b)6x²+x-1=0
a= 6
b= 1
c= -1

∆=1²–4.6.(-1)
∆= 1+24
∆= 25


c) 2x²-4x+3=0
a= 2
b= -4
c= 3

∆=(-4)²–4.2.3
∆=16–24
∆= -8


d)x²-4x+3
a= 1
b= -4
c= 3

∆=(-4)²–4.1.3
∆=16–12
∆=4