Question

Dada a função f(x)=3x-1 determine:a) f(0)= b) f(x)=0 c) f(-4)= d)f(1/2)=

Answer 1

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Resolução:

f ( X ) = 3X - 1
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f ( 0 ) = 3 ( 0 ) - 1

f ( 0 ) = 0 - 1

f ( 0 ) = - 1
________________

0 = 3X - 1

- 3X = - 1 - 0

- 3X = - 1

X = - ( 3 ) / - ( 1 )

X = 3 / 1
_____________

f ( - 4 ) = 3 ( - 4 ) - 1

f ( - 4 ) = - 12 - 1

f ( - 4 ) = - 13
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f ( 1 / 2 ) = 3 ( 1 / 2 ) - 1

f ( 1 / 2 ) = 3 / 2 - 1 / 1

f ( 1 / 2 ) = 1 / 2