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If `A/B = C/D` Prove that Each of the Given Ratio is Equal To: ((8a^3 + 15c^3)/(8b^3 + 15d^3))^(1/3) - ICSE Class 10 - Mathematics

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Question

if `a/b = c/d` prove that each of the given ratio is equal to: `((8a^3 + 15c^3)/(8b^3 + 15d^3))^(1/3)`

Solution

Let `a/b = c/b = k`

Then a =  bk and c = dk

`((8a^3 + 15c^3)/(8b^3 + 15d^3))^(1/3) =  [(8(bk)^3 + 15(dk)^3)/(8b^3 + 15d^3)]^(1/3) = [(k^3(8b^3 + 15d^3))/(8b^3 + 15d^3))]^(1/3) = k` = each given ratio

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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: 18.4

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Solution If `A/B = C/D` Prove that Each of the Given Ratio is Equal To: ((8a^3 + 15c^3)/(8b^3 + 15d^3))^(1/3) Concept: Proportions.
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