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Danwinster10
@Danwinster10
January 2020
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Para P (x) = 2x ao cubo - kx ao quadrado + 3x - 2k podemos dizer que o valor de k quando p (2) = 4 é
A -3
B 0
C 1
D 3
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Rodrigo3200
Dado:
P(x) =
2x³ - kx² + 3x - 2k
P(2) =
4
Notamo que:
x = 2
2x³ - kx² + 3x - 2k = 4
(1)
Substituindo o valor de x em (1)
2x³ - kx² + 3x - 2k = 4
2.2³ - k.2² + 3.2 - 2k = 4
2.8 - k.4 + 6 - 2k = 4
16 - 4k + 6 - 2k = 4
- 4k - 2k = 4 - 16 - 6
- 6k = - 18 x(-1)
6k = 18
k = 18/6
k = 3 (D)
1 votes
Thanks 3
Danwinster10
Por favor pode responder esta também? http://brainly.com.br/tarefa/7268562
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P(x) = 2x³ - kx² + 3x - 2k
P(2) = 4
Notamo que:
x = 2
2x³ - kx² + 3x - 2k = 4 (1)
Substituindo o valor de x em (1)
2x³ - kx² + 3x - 2k = 4
2.2³ - k.2² + 3.2 - 2k = 4
2.8 - k.4 + 6 - 2k = 4
16 - 4k + 6 - 2k = 4
- 4k - 2k = 4 - 16 - 6
- 6k = - 18 x(-1)
6k = 18
k = 18/6
k = 3 (D)