Differentiate w.r.t. x
-21x^{2}
Evaluate
-7x^{3}
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\frac{\mathrm{d}}{\mathrm{d}x}(-7x^{3})
Combine -x^{3} and -6x^{3} to get -7x^{3}.
3\left(-7\right)x^{3-1}
The derivative of ax^{n} is nax^{n-1}.
-21x^{3-1}
Multiply 3 times -7.
-21x^{2}
Subtract 1 from 3.
-7x^{3}
Combine -x^{3} and -6x^{3} to get -7x^{3}.
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