Question

Dada a função F(X)= 1-5x. Determinar:

a) F(-1)

b) F(1/5)

c) F(2)

Answer 1

Basta substituir em x.

f(x) = 1 - 5x

a) (f-1)

f(-1) = 1 - 5.(-1)

f(-1) = 1 + 5

f(-1) = 6

b) f(1/5)

f(1/5) = 1 - 5.(1/5)

f(1/5) = 1 - 5/5

f(1/5) = 1 - 1

f(1/5) = 0

c) f(2)

f(2) = 1 - 5.2

f(2) = 1 - 10

f(2) = -9

Answer 2

a)

$f(-1) = 1 - 5(-1)\\ f(-1) = 1 + 5 = 6$

b)

$f(\frac{1}{5}) = 1 - 5(\frac{1}{5})\\ f(\frac{1}{5}) = 0$

c)

$f(2) = 1 - 5(2) \\ f(2) = -9$