derivative of 7xln(x)

解

\frac{d}{d x} (7 x ln (x))

7 (ln (x) + 1)

解答ステップ

\frac{d}{d x} (7 x ln (x))

定数を除去:

(a \cdot f)^{'} = a \cdot f^{'}

= 7 \frac{d}{d x} (x ln (x))

積の法則を適用:

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

f = x, g = ln (x)

= 7 (\frac{d x}{d x} ln (x) + \frac{d}{d x} (ln (x)) x)

\frac{d x}{d x} = 1

\frac{d}{d x} (ln (x)) = \frac{1}{x}

= 7 (1 \cdot ln (x) + \frac{1}{x} x)

簡素化

7 (1 \cdot ln (x) + \frac{1}{x} x) : 7 (ln (x) + 1)

= 7 (ln (x) + 1)