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प्रश्न
If x + 2 is a factor of x2 + mx + 14, then m =
विकल्प
7
2
9
14
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उत्तर
As (x+2)is a factor of f(x) =x^2 +mx + 14
Therefore, f(-2) =0
`(-2)^2 +m(-2)+14 = 0`
`4-2m + 14 = 0`
`m = 9`
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