Question

A function is given by f(x) =3x + 5 then f(-1) =​

Answer 1

Answer:

$f( - 1) = 3( - 1) + 5 \\ \: - 3 + 5 \\ \: 2$

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Answer 2

Answer:

f-1(x) = x/3 + 5/3

Step-by-step explanation:

The inverse function is found by replacing the independent variable with the dependent variable and vice versa like so

 

f(x) = 3x-5 becomes x = 3y-5; now we solve for y

 

3y = x +5 or y = x/3 + 5/3

 

Therefore the inverse function becomes: f-1(x) = x/3 + 5/3

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