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Differentiate w.r.t. x
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3\left(-2\right)x^{3-1}+2\times 9x^{2-1}-7x^{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}.
-6x^{3-1}+2\times 9x^{2-1}-7x^{1-1}
Multiply 3 times -2.
-6x^{2}+2\times 9x^{2-1}-7x^{1-1}
Subtract 1 from 3.
-6x^{2}+18x^{2-1}-7x^{1-1}
Multiply 2 times 9.
-6x^{2}+18x^{1}-7x^{1-1}
Subtract 1 from 2.
-6x^{2}+18x^{1}-7x^{0}
Subtract 1 from 1.
-6x^{2}+18x-7x^{0}
For any term t, t^{1}=t.
-6x^{2}+18x-7
For any term t except 0, t^{0}=1.