Differentiate w.r.t. r
-1
Evaluate
144-r
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\frac{\mathrm{d}}{\mathrm{d}r}(144-r)
Subtract 50 from 194 to get 144.
-r^{1-1}
The derivative of a polynomial is the sum of the derivatives of its terms. The derivative of a constant term is 0. The derivative of ax^{n} is nax^{n-1}.
-r^{0}
Subtract 1 from 1.
-1
For any term t except 0, t^{0}=1.
144-r
Subtract 50 from 194 to get 144.
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