Maximise the Absolute

Let \(m\) and \(n\) be distinct positive integers.

Find the maximum value of \(|x^m - x^n|\), where \(x\) is a real number in the interval \((0, 1)\).

Note by Sharky Kesa
4 years, 6 months ago

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Note that \(x^r\) is a strictly decreasing function when \(x\in(0,1)\), and the maximum value would be achieved when \(m\) is the least and \(n\) is the most, in this case, \(m=1\) and \(n\to\infty\), where \(|x^m-x^n|=|x^1-0|=x\).

Note: @Sparsh Goyal posted the numerical answer first.

Kenny Lau - 3 years, 10 months ago

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The answer should be "x" !

Sparsh Goyal - 4 years ago

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In terms of m and n?

Kenny Lau - 4 years ago

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whats the answer

Manish Bhargao - 4 years ago

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0

Asama Zaldy Jr. - 4 years ago

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I dont think it will have a numeric value as answer as "x" is variable and there are infinite nos. between 0 and 1...

Sparsh Goyal - 4 years ago

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Note that it asks for a maximum value.

Sharky Kesa - 4 years ago

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Simplest thing I can think of \(|1^1-0^1|\).... It has to be more complicated than this...

Trevor Arashiro - 4 years ago

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He put (0,1), which means 0 & 1 not included, so it must be something else!!

Vivek Bhagat - 4 years ago

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That doesn't work at all. I think you typoed.

Sharky Kesa - 4 years ago

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