Sebastian N's answer to Tarah toh's Secondary 3 A Maths Singapore question.

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Sebastian N
Sebastian N's answer
15 answers (A Helpful Person)
1st
by the law of surds, multiplication/division of surds is the multiplication/division of the number in the root, and also 1 = 10⁰ so by log law, log₁₀10⁰ = 0 log₁₀10 = 0