How do you evaluate functions?

1 Answer
Alan P.
Mar 23, 2015

Assuming your function is expressed using x as a variable, evaluation of the function involves replacing each occurrence of x with some per-specified value.

That is evaluation of a function is always "at some point#.

For example if your function is
f(x) = 3x^2 -x +4
and you are asked to evaluate this function at x=2

f(2) = 3(2^2) -2 + 4 = 14

(Since this question was asked under "Functions in Slope-Intercept Form, your function might look more like:
y = 5x + 7
and you might be asked to "evaluate y at 2", but the same idea applies:
y = 5(2) + 7 = 17 )

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