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प्रश्न
If log (x2 - 21) = 2, show that x = ± 11.
योग
उत्तर
log (x2 - 21 ) = 2
⇒ x2 - 21 = 102
⇒ x2 - 21 = 100
⇒ x2 = 121
⇒ x = `+- 11 `
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Interchanging Logarithmic and Exponential Forms
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