Question

The sum of the zeroes of cubic polynomial
p(x) = 2x3 - 17x2 + 38x - 15 is
of polynomial​

Answer 1

Answer:

Given cubic polynomial is 2x³-17x²+38x-15

Let x = 3

=2(3)³-17(3)²+38(3)-15

=54 - 153 + 114 - 15

=168 - 168

=0

Hence 3 is the zero of the given polynomial.

In the same way, 

Let x = 1/2

=2(1/2)³-17(1/2)²+38(1/2)-15

=2(1/8) - 17(1/4) + 19 - 15

= 1/4 - 17/4 + 4

= -16/4 + 4

= -4 + 4

=0