Differentiate w.r.t. y
16y
Evaluate
8y^{2}-685
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\frac{\mathrm{d}}{\mathrm{d}y}(8y^{2}-685)
Subtract 750 from 65 to get -685.
2\times 8y^{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}.
16y^{2-1}
Multiply 2 times 8.
16y^{1}
Subtract 1 from 2.
16y
For any term t, t^{1}=t.
8y^{2}-685
Subtract 750 from 65 to get -685.
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