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Differentiate w.r.t. x
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\frac{\mathrm{d}}{\mathrm{d}x}(4x^{2}+21)
Add 12 and 9 to get 21.
2\times 4x^{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}.
8x^{2-1}
Multiply 2 times 4.
8x^{1}
Subtract 1 from 2.
8x
For any term t, t^{1}=t.
4x^{2}+21
Add 12 and 9 to get 21.