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प्रश्न
Solve for x, if : logx49 - logx7 + logx `1/343` + 2 = 0
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उत्तर
logx49 - logx7 + logx `1/343` + 2 = 0
⇒ logx49 - logx7 + logx (343)-1 = - 2
⇒ logx49 - logx7 - logx (343) = - 2
⇒ logx`[49/[7 xx 343]]` = - 2
⇒ logx`[1/49]` = - 2
⇒ x-2 = `1/49`
⇒ `1/x^2=1/49`
⇒ x2 = 49
⇒ x = `sqrt49`
⇒ x = 7
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