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Question
Mark the correct alternative in each of the following:
If x − 2 is a factor of x2 + 3ax − 2a, then a =
Options
2
-2
1
-1
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Solution
As (x -2)is a factor of `f(x) = x^2 +3ax - 2a`
i.e. f(2) = 0
`(2)^2 +3a (2) -2a = 0`
`4 +6a -2a = 0`
` = -1`
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