Question

If `f(x) = x(2x-1)`, what is `f(3)`?

Answer 1

See a solution process below:

Explanation:

To solve `f(3)` substitute `color(red)(3)` for each occurrence of `color(red)(x)` in `f(x)`

`f(color(red)(x)) = color(red)(x)(2color(red)(x) - 1)` becomes:

`f(color(red)(3)) = color(red)(3)((2 xx color(red)(3)) - 1)`

`f(color(red)(3)) = color(red)(3)(6 - 1)`

`f(color(red)(3)) = color(red)(3) xx 5`

`f(color(red)(3)) = 15`

You can use this same process to answer all the other questions you asked on your own.