1.

If `(a-2b-3c+4d)(a+2b+3c+4d) = (a+2b-3c-4d)(a-2b+3c-4d)` then `2ad =`A. `3bc`B. `bc`C. `5bc`D. `2bc`

Answer» Correct Answer - A
If `(a-2b-3c+4d)` …………….
`(a+2b+3c+4d)/(a+2b-3c-4b) = (a- 2b+3c-4d)/(a-2b-3c+4d)`
Using `C & D (a+2b)/(3c+4d) = (a-2b)/(3c - 4d)`
Using `C & D` again `(a)/(2b) = (3c)/(4d)`
`implies 2ad = 3bc`


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