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If (4a + 9b) (4c – 9d) = (4a – 9b) (4c + 9d), prove that: a: b = c: d.
If (4a + 9b) (4c – 9d) = (4a – 9b) (4c + 9d), prove that: a: b = c: d.
Class 10 | Exercise 7D | ICSE | Ratio and Proportion | Selina
If (4a + 9b) (4c – 9d) = (4a – 9b) (4c + 9d), prove that: a: b = c: d.

Concise Selina Solutions Class 10 Maths Chapter 7 ex. 7(D) - 15

Applying componendo and dividendo:

Concise Selina Solutions Class 10 Maths Chapter 7 ex. 7(D) - 16

\[\begin{array}{*{35}{l}}

8a/18b\text{ }=\text{ }8c/18d  \\

a/b\text{ }=\text{ }c/d  \\

\end{array}\]

i

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