Evaluate: $\log_{10} 8 + \log_{10} 125$
A2
B3CORRECT
C4
D5
GCEMathematicsNumber and Numeration2020
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Why the answer is B, and why the others tempt you.
Using the logarithm product rule: log₁₀ 8 + log₁₀ 125 = log₁₀ (8 × 125) = log₁₀ 1000 = log₁₀ 10³ = 3. The product 8 × 125 = 1000 = 10³, so the answer is 3.
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