Differentiate w.r.t. b
-64b^{3}
Evaluate
-16b^{4}
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4\left(-16\right)b^{4-1}
The derivative of ax^{n} is nax^{n-1}.
-64b^{4-1}
Multiply 4 times -16.
-64b^{3}
Subtract 1 from 4.
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