मराठी

If f(x) = x-1x+1, then show that f(-1x)=-1f(x) - Mathematics

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प्रश्न

If f(x) = `(x - 1)/(x + 1)`, then show that `f(- 1/x) = (-1)/(f(x))`

बेरीज
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उत्तर

f(x) = `(x - 1)/(x + 1)`

Substituting x by `– 1/x`, we get

`f(- 1/x) = ((- 1/x) - 1)/((- 1/ x) + 1)`

= `((-1 - x)/x)/((-1 + x)/x)`

= `(-1 - x)/(-1 + x)`

= `(-(x + 1))/(x - 1)`

= `(-1)/((x - 1)/(x + 1))`

Therefore,

`f(- 1/x) = (-1)/(f(x))`

Hence proved.

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पाठ 2: Relations and Functions - Exercise [पृष्ठ ३०]

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एनसीईआरटी एक्झांप्लर Mathematics [English] Class 11
पाठ 2 Relations and Functions
Exercise | Q 20.(ii) | पृष्ठ ३०
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