Part of ALG-11 — Logarithms, Exponentials & Functional Equations

Solving Logarithmic Equations

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Strategy: (1) Combine logs using product/quotient rules. (2) Convert to exponential form. (3) Solve the resulting algebraic equation. (4) CHECK all solutions against the original domain (all arguments > 0, all bases > 0 and != 1). Step 4 is non-negotiable — it eliminates extraneous solutions. Example: log(x) + log(x-3) = 1 gives x23xx^{2-3x} = 10, x = 5 or x = -2. Domain requires x > 0 AND x-3 > 0, so x > 3. Only x = 5 is valid.

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