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Question

If roots of the equation ax3+bx2+cx+d=0 remain unchanged by increasing each coefficient by one unit, then


A

a = b = c = d 0

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B

a = b c = d 0

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C

abcd0

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D

a0, b+c=0, d0

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Solution

The correct option is A

a = b = c = d 0


The roots of ax3+bx2+cx+d=0 and (a+1)x3+(b+1)x3+(c+1)x+(d+1)=0 are same.
a+1a=b+1b=c+1c=d+1d a=b=c=d0


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