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यदि `3^(x+y)=81` और `81^(x-y)=3` है तो `x` का मान ज्ञात करें।A. `42`B. `15/8`C. `17/8`D. `39` |
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Answer» Correct Answer - C `3^(x+y)=81` `3^(x+y)=3^(4)` `impliesx+y=4` `81^(x-y)=3` ………..i `3^(4x-46)=3^(1)` `implies4x-4y=1`……………ii from equation i and ii `4x-4y=1` `4x+4y=16` `=8x=17` `x=17/8` |
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