Number Systems · Class 9 · CBSE Mathematics

Simplify the expression: 2^{2/3} cdot 2^{1/5}.

Practice question from Number Systems (Class 9 · CBSE Mathematics), with the correct answer and a step-by-step solution.

medium · MCQ · Q-A3292C

Simplify the expression: 22/3⋅21/52^{2/3} \cdot 2^{1/5}.

  1. A.2^{3/8}
  2. B.2^{13/15}Correct answer
  3. C.4^{2/15}
  4. D.2^{2/15}

Solution

Using the laws of exponents am⋅an=am+na^m \cdot a^n = a^{m+n}, we add the powers: 2/3+1/52/3 + 1/5. The LCM of 3 and 5 is 15. So, 2/3=10/152/3 = 10/15 and 1/5=3/151/5 = 3/15. Adding them gives 13/1513/15. Thus, the simplified expression is 213/152^{13/15}.

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