Topic Details (Notes format)

How to Solve Logarithmic Inequalities

Subject: Mathematics

Book: Maths Mastery

Log inequalities like log(x) > 2 or log₂(x–1) ≤ 3 require understanding domain (x>0 for log base 10, x–1>0 for log₂) and exponential transformations. For log(x)>2, rewrite as x>10²=100. Solve carefully, checking intervals against log domain constraints. More complex expressions may involve combining log properties or adding constants. Log inequalities arise in pH ranges, decibel thresholds, or exponential growth constraints. Systematic approach ensures correct intervals, avoiding extraneous solutions from domain missteps.

Practice Questions

The sum of the reciprocals of two numbers is 1/4. If one number is 12, what is the other?

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If the ratio of two numbers is 3:5 and their HCF is 4, what are the numbers?

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If the sum of three consecutive integers is 72, what are the integers?

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