Differentiate w.r.t. a
15
Evaluate
15a
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\frac{\mathrm{d}}{\mathrm{d}a}(15a)
Combine 40a and -25a to get 15a.
15a^{1-1}
The derivative of ax^{n} is nax^{n-1}.
15a^{0}
Subtract 1 from 1.
15\times 1
For any term t except 0, t^{0}=1.
15
For any term t, t\times 1=t and 1t=t.
15a
Combine 40a and -25a to get 15a.
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