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# Evaluating Functions

We evaluate a function at a particular value. If the function $$f(x) = x^3 + x + 1$$ is evaluated at $$x = -2$$, we denote this as $$f(-2$$.

In this case, that would require replacing every instance of $$x$$ in the function's definition with the value to be evaluated, like this:

$f(-2) = (-2)^3 + (-2) + 1 = -8 -2 +1 = -9.$

Note by Arron Kau
2 years, 5 months ago