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Differentiate w.r.t. x
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3\times 3x^{3-1}+2\left(-2\right)x^{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}.
9x^{3-1}+2\left(-2\right)x^{2-1}
Multiply 3 times 3.
9x^{2}+2\left(-2\right)x^{2-1}
Subtract 1 from 3.
9x^{2}-4x^{2-1}
Multiply 2 times -2.
9x^{2}-4x^{1}
Subtract 1 from 2.
9x^{2}-4x
For any term t, t^{1}=t.