Question

Apenas o valor do discriminante

a) 5X² -3X -2+ = 0

b) 3X² + 55 = 0

c) X² - 6X = 0

d) X² - 10X + 23 = 0

e) X² -X - 20 = 0

f) X² -10 +25 = 0

g) X² -3X -4 = 0

Answer 1

a)

Δ = b² - 4.a.c
Δ = (-3)² - 4.(5).(-2)
Δ = 9 + 40
Δ = 49

b)

Δ = b² - 4.a.c
Δ = (0)² - 4.(3).(55)
Δ = 0 - 660
Δ = -660

c)

Δ = b² - 4.a.c
Δ = (-6)² - 4.(1).(0)
Δ = 36 - 0
Δ = 36

d)

Δ = b² - 4.a.c
Δ = (-10)² - 4.(1).(23)
Δ = 100 - 92
Δ = 8

e)

Δ = b² - 4.a.c
Δ = (-1)² - 4.(1).(-20)
Δ = 1 + 80
Δ = 81

f)

Δ = b² - 4.a.c
Δ = (-10)² - 4.(1).(25)
Δ = 100 - 100
Δ = 0

g)

Δ = b² - 4.a.c
Δ = (-3)² - 4.(1).(-4)
Δ = 9 + 16
Δ = 25