Differentiate w.r.t. x_9
1
Evaluate
x_{9}+80
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\frac{\mathrm{d}}{\mathrm{d}x_{9}}(80+x_{9})
Add 21 and 59 to get 80.
x_{9}^{1-1}
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}.
x_{9}^{0}
Subtract 1 from 1.
1
For any term t except 0, t^{0}=1.
80+x_{9}
Add 21 and 59 to get 80.
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