Question

If V5 and - v5 are two zeroes of the
polynomial x2 + 3x2 - 5x - 15, then its third
zero is
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ا
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Answer 1

Answer:

Let x, y, z are roots of equation

Given x=root5 and y=-root5 x+y=0

Then z =

Sum of roots =-b/a

x+y+z= - 3

z=-3