Differentiate w.r.t. a
80a^{3}
Evaluate
20a^{4}
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\frac{\mathrm{d}}{\mathrm{d}a}(20a^{4})
Multiply 10 and 2 to get 20.
4\times 20a^{4-1}
The derivative of ax^{n} is nax^{n-1}.
80a^{4-1}
Multiply 4 times 20.
80a^{3}
Subtract 1 from 4.
20a^{4}
Multiply 10 and 2 to get 20.
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Limits
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