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Question
Select the correct answer from the given alternative:
If y = `("a"x + "b")/("c"x + "d")`, then `("d"y)/("d"x)` =
Options
`("ab" - "cd")/("c"x + "d")^2`
`("a"x - "c")/("c"x + "d")^2`
`("ac" - "bd")/("c"x + "d")^2`
`("ad" - "bc")/("c"x + "d")^2`
Solution
If y = `("a"x + "b")/("c"x + "d")`, then `("d"y)/("d"x)` = `("ad" - "bc")/("c"x + "d")^2`
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