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LarisPaulaT
@LarisPaulaT
December 2019
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(CEFET-PR) Se f(g(x))= 4x²-8x+6 e g(x)= 2x-1, então f(2) é igual a:
a) -2
b) -1
c) 3
d) 5
e) 6
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JVictor14
Primeiro, vamos igualar as equações:
f(g(x)) = 4x² - 8x+6
g(x) = 2x-1
Agora, vamos substituir:
f(g(x)) = f(2x-1)
Desse modo:
f(2) = 2x-1
f(2) = 2*2-1
f(2) = 4-1
f(2) = 3
R: alternativa c) 3
Espero ter ajudado
2 votes
Thanks 3
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Lista de comentários
f(g(x)) = 4x² - 8x+6
g(x) = 2x-1
Agora, vamos substituir:
f(g(x)) = f(2x-1)
Desse modo:
f(2) = 2x-1
f(2) = 2*2-1
f(2) = 4-1
f(2) = 3
R: alternativa c) 3
Espero ter ajudado