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Question
Solve the following:
log (x + 1) + log (x - 1) = log 48
Sum
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Solution
log (x + 1) + log (x - 1) = log 48
⇒ log {(x + 1)(x - 1)} = log 48
⇒ log (x2 - 1) = log 48
⇒ x2 - 1 = 48
⇒ x2 = 49
⇒ x = 7 ...(neglecting the negative value).
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