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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