Question

If `f(x) = 2x^2-10`, what is `f(5)`?

Answer 1

See a solution process below:

Explanation:

To find `f(5)` substitute `color(red)(5)` for each occurrence of `color(red)(x)` in `f(x)`:

`f(color(red)(x)) = 2color(red)(x)^2 - 10` becomes:

`f(color(red)(5)) = (2 * color(red)(5)^2) - 10`

`f(color(red)(5)) = (2 * 25) - 10`

`f(color(red)(5)) = 50 - 10`

`f(color(red)(5)) = 40`