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Differentiate w.r.t. b
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2\left(-9\right)b^{2-1}
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}.
-18b^{2-1}
Multiply 2 times -9.
-18b^{1}
Subtract 1 from 2.
-18b
For any term t, t^{1}=t.