Q:
If (4a +7b) (4c-7d) = (4a -7b) (4c +7d, then which one of the following is correct ?
Answer & Explanation
Answer: A) a/b = c/d
Explanation: (4a+7b)(4c-7d) = (4a-7b)(4c+7d)
(4a+7b)/(4a-7b) = (4c+7d)/(4c-7d)
Using componendo and dividendo
(4a+7b)+(4a-7b) / (4a+7b)-(4a-7b)
= (4c+7d)+(4c-7d) / (4c+7d)-(4c-7d)
Or 8a/14b = 8c/14d
Or a/b = c/d
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