derivative of (5x^2-4xe^x)

解答

\frac{d}{d x} ((5 x^{2} - 4 x) e^{x})

5 e^{x} x^{2} + 6 e^{x} x - 4 e^{x}

求解步骤

\frac{d}{d x} ((5 x^{2} - 4 x) e^{x})

使用微分乘法定则:

(f \cdot g)^{'} = f^{'} \cdot g + f \cdot g^{'}

f = 5 x^{2} - 4 x, g = e^{x}

= \frac{d}{d x} (5 x^{2} - 4 x) e^{x} + \frac{d}{d x} (e^{x}) (5 x^{2} - 4 x)

\frac{d}{d x} (5 x^{2} - 4 x) = 10 x - 4

\frac{d}{d x} (e^{x}) = e^{x}

= (10 x - 4) e^{x} + e^{x} (5 x^{2} - 4 x)

化简

(10 x - 4) e^{x} + e^{x} (5 x^{2} - 4 x) : 5 e^{x} x^{2} + 6 e^{x} x - 4 e^{x}

= 5 e^{x} x^{2} + 6 e^{x} x - 4 e^{x}

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