CPM Homework Help : PC Problem 8-128

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8-128.

Find the slope of the line joining $\left(1, f\left(1\right)\right)$ and $\left(4, f\left(4\right)\right)$ if:

$f(x)=8-x^2$
Step:
$m=\frac{f(4)-f(1)}{4-1}$

$f(x)=2^x$

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