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Find int (2^(x + 1) – 5^(x – 1))/(10^x) dx - Mathematics

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प्रश्न

Find `int (2^(x + 1) - 5^(x - 1))/(10^x) dx`

योग
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उत्तर

`int (2^(x + 1) - 5^(x - 1))/(10^x) dx = int (2^(x + 1) - 5^(x - 1))/(2^x.5^x) dx`

= `int (2^(x + 1)/(2^x.5^x) - 5^(x - 1)/(2^x.5^x)) dx`

= `int 2/5^x dx - int 1/(5.2^x) dx`

= `2 int 5^(-x) dx - 1/5 int 2^(-x) dx`

= `2 xx (-5^(-x))/(log 5) - 1/5 xx (-2^(-x))/(log 2)`

= `1/(5.2^x log 2) - 2/(5^x log 5)`

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