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MISCELLANEOUS EXERCISE 4 (II) · Q112

Q.Prove the following by using method of induction: log⁡axn=nlog⁡ax\log_a x^n = n \log_a x, x>0x > 0, n∈Nn \in N.

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Let P(n):log⁡axn=nlog⁡axP(n):\log_ax^n=n\log_ax. Base: n=1n=1: log⁡ax=1⋅log⁡ax\log_ax=1\cdot\log_ax; trivially true. Hypothesis: assume log⁡axk=klog⁡ax\log_ax^k=k\log_ax. Step: log⁡axk+1=log⁡a(xk⋅x)=log⁡axk+log⁡ax\log_ax^{k+1}=\log_a(x^k\cdot x)=\log_ax^k+\log_ax (product rule of logarithms) =klog⁡ax+log⁡ax=(k+1)log⁡ax=k\log_ax+\log_ax=(k+1)\log_ax, matching P(k+1)P(k+1). * …

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