Question

1. Considere as funções f e g, ambas com domínio Z, dadas por f(x) = x²- 2x e g(x) = x³-1. Associe as colunas e assinale a alternativa que apresenta a sequência correta: *
1 ponto
a) f (-2) ( )29
b) g(-2) ( )15/7
c) f(-1) + g(3) ( )8
d) f(5) : g(2) ( )-9

a) C, D, A, B
b) A, B, D, C
c) D, C, A, B
d) A, C, D, B



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Answer 1

Answer:

(A)C,D,A,B

Step-by-step explanation:

$f(x) = x^2- 2x\\g(x) = x^3-1$

a)

$f(-2) = (-2)^2- 2(-2)\\=4-(-4)\\=4+4\\=8 (C)$

b)

$g(-2) = (-2)^3-1\\\=-8-1\\=-9 (D)$

c)

$f(-1) = (-1)^2- 2(-1)=1+2=3\\g(3) = (3)^3-1=27-1=26\\f(-1) + g(3)=3+26\\=29 (A)$

d) f(5) : g(2)

$f(5) = (5)^2- 2(5)=25-10=15\\g(2) = (2)^3-1=8-1=7\\f(5) :g(2)=15/7 (B)$