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प्रश्न
Solve for x : log (x2 - 21) = 2.
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उत्तर
log ( x2 - 21 ) = 2
⇒ log ( x2 - 21) = log 100
⇒ x2 - 21 - 100 = 0
⇒ x2 - 121 = 0
⇒ x2 = 121
⇒ x = `+- sqrt121`
⇒ x =`+-`11
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