Differential Calculus (id: 744728d58)

本题目来源于试卷: Differential Calculus，类别为 IB数学

[填空题]
Consider the curve $ y=(k x-1) \ln (2 x)$ where $ k \in \mathbb{R}$ and x>0 .
The tangent to the curve at x=2 is perpendicular to the line $y=\frac{2}{5+4 \ln 4} x$ .
Find the value of k .   

参考答案: -2±2%


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