Differentiate w.r.t. r
130r
Evaluate
65r^{2}
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\frac{\mathrm{d}}{\mathrm{d}r}(65r^{2})
Combine 81r^{2} and -16r^{2} to get 65r^{2}.
2\times 65r^{2-1}
The derivative of ax^{n} is nax^{n-1}.
130r^{2-1}
Multiply 2 times 65.
130r^{1}
Subtract 1 from 2.
130r
For any term t, t^{1}=t.
65r^{2}
Combine 81r^{2} and -16r^{2} to get 65r^{2}.
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