Question

Calcule o discriminante (Δ)
Δ= b²-4.a.c

I) x²-3x=0

j) x²+5=0

Answer 1

Resposta:

i) a= 1  b= -3 c= 0

    Δ= (-3)²-4.1.0

    Δ= 9-0

    Δ= 9

j) a= 1  b=0  c=0

    Δ= 0²-4.1.0

    Δ= 0-0

    Δ= 0

Answer 2

I) 3 - 4.(1).(0)
= 9 - 0
=9

X1= -3 - 3
——— = -9/2
2

X2= -3 + 3
———- = 0
2

J) 5 - 4.(1).(0)
= 25 - 0
= 25

X1= -5-5
———= -5
2

X2= -5+5
———-= 0
2