x^4 - 6*x^2的导数

该计算器将求$$$x^{4} - 6 x^{2}$$$的导数，并显示步骤。

您的输入

求$$$\frac{d}{dx} \left(x^{4} - 6 x^{2}\right)$$$。

解答

和/差的导数等于导数的和/差：

$${\color{red}\left(\frac{d}{dx} \left(x^{4} - 6 x^{2}\right)\right)} = {\color{red}\left(\frac{d}{dx} \left(x^{4}\right) - \frac{d}{dx} \left(6 x^{2}\right)\right)}$$

应用幂次法则 $$$\frac{d}{dx} \left(x^{n}\right) = n x^{n - 1}$$$，其中 $$$n = 4$$$:

$${\color{red}\left(\frac{d}{dx} \left(x^{4}\right)\right)} - \frac{d}{dx} \left(6 x^{2}\right) = {\color{red}\left(4 x^{3}\right)} - \frac{d}{dx} \left(6 x^{2}\right)$$

对 $$$c = 6$$$ 和 $$$f{\left(x \right)} = x^{2}$$$ 应用常数倍法则 $$$\frac{d}{dx} \left(c f{\left(x \right)}\right) = c \frac{d}{dx} \left(f{\left(x \right)}\right)$$$：

$$4 x^{3} - {\color{red}\left(\frac{d}{dx} \left(6 x^{2}\right)\right)} = 4 x^{3} - {\color{red}\left(6 \frac{d}{dx} \left(x^{2}\right)\right)}$$

应用幂次法则 $$$\frac{d}{dx} \left(x^{n}\right) = n x^{n - 1}$$$，其中 $$$n = 2$$$:

$$4 x^{3} - 6 {\color{red}\left(\frac{d}{dx} \left(x^{2}\right)\right)} = 4 x^{3} - 6 {\color{red}\left(2 x\right)}$$

化简：

$$4 x^{3} - 12 x = 4 x \left(x^{2} - 3\right)$$

因此，$$$\frac{d}{dx} \left(x^{4} - 6 x^{2}\right) = 4 x \left(x^{2} - 3\right)$$$。

答案

$$$\frac{d}{dx} \left(x^{4} - 6 x^{2}\right) = 4 x \left(x^{2} - 3\right)$$$A

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