Differentiate w.r.t. k
-15
Evaluate
16-15k
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\frac{\mathrm{d}}{\mathrm{d}k}(16-15k)
Combine -40k and 25k to get -15k.
-15k^{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}.
-15k^{0}
Subtract 1 from 1.
-15
For any term t except 0, t^{0}=1.
16-15k
Combine -40k and 25k to get -15k.
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