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Find the Mean Proportional Between a - B And A^3 - A^2b - ICSE Class 10 - Mathematics

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Question

Find the mean proportional between `a - b and a^3 - a^2b`

Solution

Let the mean proportional between a – b and a3 – a2b be x.
⇒ a – b, x, a3 – a2b are in continued proportion.
⇒ a – b : x = x : a3 – a2b
⇒ x × x = (a – b) (a3 – a2b)
⇒ x2 = (a – b) a2(a – b) = [a(a – b)]2
⇒ x = a(a – b)

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APPEARS IN

 Selina Solution for Selina ICSE Concise Mathematics for Class 10 (2018-2019) (2017 to Current)
Chapter 7: Ratio and Proportion (Including Properties and Uses)
Ex.7B | Q: 3.3

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Solution Find the Mean Proportional Between a - B And A^3 - A^2b Concept: Proportions.
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