Question

raiz da equação x²-4x-5=0

Answer 1

Usando a fórmula de Bhaskara: 4[+ou-]√16-4.-5/2=4[+ou-]√36/2=4[+ou-]6/2

X1=4+6/2=10/2=5

X2=4-6/2=-2/2=-1

As raízes são 5 e -1.

Answer 2

×2-4×(-5)=0

×2+20=0

×2=-20