calculus · worked example

Solve √x = 12x

Method: 分數指數的冪函數微分法則. Verified step-by-step solution with our free AI math solver.
Problem

ddxx\frac{d}{dx}\sqrt{x}

Step-by-step solution

  1. 改寫為冪次形式:x=x1/2\sqrt{x} = x^{1/2}

  2. 套用冪函數微分法則,n=12n = \tfrac{1}{2}ddx(x1/2)=12x1/2\frac{d}{dx}(x^{1/2}) = \tfrac{1}{2} x^{-1/2}

  3. 改寫回根式形式:12x\frac{1}{2\sqrt{x}}

  4. 定義域:在 x>0x > 0 時成立(函數有定義且可微分)。

Answer

12x\frac{1}{2\sqrt{x}}

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