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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



ajuuuuuda

1 Answer

3 votes

Answer:

(A)C,D,A,B

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)

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