If $f (x) = 3 x + 1$ $f(x) = 3x + 1$ , then what is f(3)?

Question

14013 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2017-01-16T12:51:09

$f (3) = 10$ $f(3) = 10$

To calculate $f (3)$ $f(3)$ we need to substitute $3$ $color(red)(3)$ for $x$ $color(red)(x)$ in the function:

$f (x) = 3 x + 1$ $f(color(red)(x)) = 3color(red)(x) + 1$ becomes:

$f (3) = (3 \times 3) + 1$ $f(color(red)(3)) = (3 xx color(red)(3)) + 1$

$f (3) = 9 + 1$ $f(color(red)(3)) = 9 + 1$

$f (3) = 10$ $f(color(red)(3)) = 10$

If f(x)=3x+1f(x) = 3x + 1, then what is f(3)?