Differentiate w.r.t. r
-8
Evaluate
-8r
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\frac{\mathrm{d}}{\mathrm{d}r}(-8r)
Combine r and -9r to get -8r.
-8r^{1-1}
The derivative of ax^{n} is nax^{n-1}.
-8r^{0}
Subtract 1 from 1.
-8
For any term t except 0, t^{0}=1.
-8r
Combine r and -9r to get -8r.
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