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Question

If one root of the equation 2x2+ax+6=0 is 3, then find the value of a



A

-8

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B

7

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C

3

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D

-5

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Solution

The correct option is A

-8


If one root of the equation 2x2+ax+6=0 is  3,
then x=3 will satisfy the equation,
 

2(3)2+3a+6=0

 18+3a+6=0

24+3a=0

  a=8


Mathematics

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