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Question

Sum of the roots of the equation is 4x3(2x+3)+128=0


A

6

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B

5

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C

7

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D

8

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Solution

The correct option is C

7


Put 2x=y, then the equation becomes:

y23(8y)+128=0y224y+128=0(y8)(y16)=0y=16,82x=16,8x=4,3

Sum of the roots is 7.


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