Topic Details (Notes format)

How to Solve Logarithmic Equations

Subject: Mathematics

Book: Maths Mastery

Logarithmic equations typically appear in forms like log_a(x) = b, which implies x = a^b. If you have log(2x – 1) = 2, you can rewrite it in exponential form as 2x – 1 = 10² = 100, yielding x = 50. More advanced problems might combine multiple log terms, requiring properties like log(mn) = log(m) + log(n) or log(m/n) = log(m) – log(n). Logarithms are crucial for measuring pH in chemistry, decibels in sound, or earthquake magnitudes on the Richter scale. Proficiency in solving log equations ensures the ability to tackle scientific data, high-level mathematics, and real-world measurement problems.

Practice Questions

The angles of a quadrilateral are in the ratio 3:4:5:6. What is the largest angle?

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A sum of money doubles itself in 5 years at simple interest. What is the rate of interest?

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A sphere has a radius of 7 cm. What is its volume?

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The sum of the squares of two consecutive integers is 145. What are the integers?

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If the perimeter of a square is 36 cm, what is the length of its diagonal?

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The area of an equilateral triangle with side length 6 cm is:

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What is the HCF of 48 and 180?

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What is the value of x if 3x + 7 = 16?

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If the cost price of an item is Rs. 400 and the selling price is Rs. 500, what is the profit percentage?

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If 2x = 16, what is the value of x?

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