Question

If sum of two roots of x3 -5x2 -16x+80=0 is zero , find the third root

Answer 1

the sum of roots of a cubic polynomial is -b/a

i.e the sum of roots=5

i.e o+x=5

therefore the third root is 5

Answer 2

the sum of roots of a cubic polynomial is -b/a

i.e the sum of roots=5

i.e o+x=5

therefore the third root is 5