Question

Quais são as raízes da equação x²-3x-4=0? faça a conta please

Answer 1

x²-3x-4=0

Δ=(-3)²-4*1*(-4)

Δ=9+16

Δ=25

x=$\frac{-(-3)+\sqrt{25}}{2*1}$

x=$\frac{3+5}{2}$

x=$\frac{8}{2}$

x=4

x=$\frac{-(-3)-\sqrt{25}}{2*1}$

x=$\frac{3-5}{2}$

x=$\frac{-2}{2}$

x=-1