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State, True Or False : Log2 8 = 3 and Log8 = 2 = 1/3 - Mathematics

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Question

State, true or false : log2 8 = 3 and log8 = 2 = `1/3`

Sum

Solution

Consider the equation
log28 = 3
⇒ 23 = 8                                ....(1)
Now consider the equation
log82 = `1/3`
⇒ `8^(1/3) = 2`

⇒ `(2^3)^(1/3) = 2 `                ...(2)

Both the equations (1) and (2) are correct.
Thus the given statements, log28 = 3 and log82 = `1/3` are true.

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Interchanging Logarithmic and Exponential Forms
  Is there an error in this question or solution?
Chapter 8: Logarithms - Exercise 8 (A) [Page 103]

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Selina Concise Mathematics [English] Class 9 ICSE
Chapter 8 Logarithms
Exercise 8 (A) | Q 5.3 | Page 103
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