Question 3. If (4a + 5b) (4c – 5d) = (4a – 5d) (4c + 5d), prove that a, b, c, d are in proporton.

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Asked: March 19, 20212021-03-19T10:41:07+05:30 2021-03-19T10:41:07+05:30In: ICSE

This is a basic question from ML aggarwal book of class 10th, chapter 7, ratio and proportion., ICSE board

In this question we have been given that

(4a + 5b) (4c – 5d) = (4a – 5d) (4c + 5d),

And we have to apply mathematical operations to prove that a, b, c, d are in proporton.

Question no 3, 7.3

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AAREKH · Answer 1 · 2021-03-20T07:28:35+05:30

AAREKH Guru

Solution:

It is given that

(4a + 5b) (4c – 5d) = (4a – 5d) (4c + 5d)

We can write it as

ML Aggarwal Solutions for Class 10 Chapter 7 Image 54

Therefore, it is proved that a, b, c, d are in proportion.