Question

Determine o valor da expressão b²-4ac quando:
a) a=3, b=2 e c=4
b) a=2, b=4 e c=10
c) a=1, b=-5 e c=6

Answer 1

a) x=2^2 - 4.(3).(4)
x= 4-48
x= -44

b) x= 4^2- 4.2.10
x= 16-80
x= -64

c) x= -5^2 - 4.1.6
x= 25-24
x= 1

Answer 2

a)
a = 3, b = 2 e c = 4
Δ = b² - 4ac
Δ = 2² - 4.3.4
Δ = 4 - 12.4
Δ = 4 - 48
Δ = - 44

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b)
a = 2, b = 4 e c = 10
Δ = b² - 4ac
Δ = 4² - 4.2.10
Δ = 16 - 8.10
Δ = 16 - 80
Δ = - 64

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c)
a = 1, b = - 5 e c = 6
Δ = b² - 4ac
Δ = (-5)² - 4.1.6
Δ = 25 - 24
Δ = 1

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