Question

2) Utilizando a fórmula de Bháskara, resolva as equações do 2 grau:

a) x elevado a 2+x-20=0

b) x elevado a 2-4x+3=0

Answer 1

A)Δ=B²-4AC
Δ=1²-4.1.-20
Δ=1+80
Δ=81
X=-B+-√Δ
  ______
    2A
X`=-1+9/2=8/2=4
X``=-1-9/2=-10/2=-5

B)
Δ=16-4.1.+3
Δ=16-12
Δ=4
X´=4+2/2=6/2=3
X``=4-2/2=2/2=1