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Learn Precalculus Functions

Evaluate and compose functions

Replace the input everywhere it appears.

Precalculus: Functions

Work through it

$f (x) = x^{2} + 1$ . Find $f (3)$ .

$3^{2} + 1 = 10$

$f (x) = 2 x$ and $g (x) = x + 1$ . Find $f (g (2))$ .

$g (2) = 3$

$f (3) = 6$

Watch out for this

$f (g (x))$ is the same as $f (x) g (x)$ .

Composition feeds one output into the other function. It isn't multiplication.

Your turn

NextDomain and inverses

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