Answer
$-3x-3h+4$
Work Step by Step
We are given that $f(x)=-3x+4$. In order to evaluate the function at $x+h$, we can plug in $x+h$ to the function and evaluate directly.
$f(x+h)=-3(x+h)+4=(-3)(x)+(-3)(h)+4=-3x-3h+4$
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