Question

Dada a Funçaõ do 1° Grau f(x) = 1 - 5 x , Determine
a-) f(x)=0

b-) f(-1)

c-) f(1/5)

d-)f(-1/5)

Answer 1

f(x) = 1 - 5x

f(x) = 0
1 - 5x = 0
- 5x = - 1  .(-1)
5x = 1
x = 1/5

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f(x)  = 1 - 5x
f(-1) = 1 - 5.(-1)
f(-1) = 1 + 5
f(-1) = 6

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f(1/5) = 1 -5 .1/5
f(1/5) = 1 - 5/5
f(1/5) = 1 - 1
 f(1/5) = 0
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 f(- 1/5) = 1 - 5.(-1/5)
 f(-1/5) = 1 + 5/5
 f(-1/5) = 1 + 1
f(-1/5) = 2