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Evaluate
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Differentiate w.r.t. b
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7b^{4}\times 2
To multiply powers of the same base, add their exponents. Add 3 and 1 to get 4.
14b^{4}
Multiply 7 and 2 to get 14.
\frac{\mathrm{d}}{\mathrm{d}b}(7b^{4}\times 2)
To multiply powers of the same base, add their exponents. Add 3 and 1 to get 4.
\frac{\mathrm{d}}{\mathrm{d}b}(14b^{4})
Multiply 7 and 2 to get 14.
4\times 14b^{4-1}
The derivative of ax^{n} is nax^{n-1}.
56b^{4-1}
Multiply 4 times 14.
56b^{3}
Subtract 1 from 4.