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If x = 1,2,3,4 satisfy the equation  ax^3+(b-1)x^2+cx+(d+2)=0  then the value of a+b+c+d is

Option: 1

4


Option: 2

0


Option: 3

-1


Option: 4

None of these


Answers (1)

best_answer

As '3 degree' equation has 4 roots. So it is an identity. Thus,

a =0 ,

b -1=0 ⇒ b=1

c =0

d + 2 =0 ⇒ d = -2

So a + b+ c+ d = 0+1+0+(-2) = -1

Posted by

manish painkra

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