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Question
If a = – 1, b = 2, then find the value of the following:
ab – ba
Sum
Solution
Given, ab – ba
If a = –1 and b = 2,
Then (–1)2 – (2)–1
= `1 - 1/2^1` ...`[∵ a^-m = 1/a^n]`
= `(2 - 1)/2`
= `1/2`
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Chapter 8: Exponents and Powers - Exercise [Page 274]
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