Question

What is the sum of the roots of this polynomial?
y=3x^3+12x^2+3x-18

Answer 1

\[-4\]

Answer 2

method 1) ( the hard way) find the roots and add them. your polynomial is
\[3 (x-1) (x+2) (x+3)\] so roots are 1,-2,-3 and they add to -4

Answer 3

method 2) the easy way
take
\[-\frac{12}{3}=-4\]

Answer 4

Thank you so much!