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Question

If two of the zeros of the cubic polynomial ax3+bx2+cx+d are 0 then the third zero is

(a) ba (b) ba (c) ca (d) da

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Solution

Let the required roots be p ,q ,r
let the two roots let p and q be 0 (given)
we know that sum of roots = -b/a
p + q + r = -b/a
0 + 0 + r = -b/a
r = -(b/a)
so option a is correct


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