Question

x ao quadrado menos 3X menos 4 igual a zero

Answer 1

x²-3x-4=0

Formula de Bháskara
a=1
b=-3
c=-4
Encontrando o Δ
Δ=b²-4ac
Δ=(-3)²-4*1*(-4)
Δ=9+16
Δ=25

X=(-b⁺₋√Δ)/2a
X=[-(-3)⁺₋√25]/2*1
X=(3⁺₋5)/2

X'=(3+5)/2=8/2=4
X''=(3-5)/2=-2/2=-1