If #-1# is one of the zeros of #x^3+ax^2+bx+c=0#, then product of other two roots is?
(a) #b+1-a#
(b) #1-a-b#
(c) #a+b+c#
(d) #c-a-b#
(a)
(b)
(c)
(d)
1 Answer
Aug 3, 2017
Answer is (a).
Explanation:
As
we have
Further if
we should have
and as constant term in the product is
comparing it with
Now taking
and using (A) product of the other two roots is
and hence answer is (a).