Question

What is the sum of the roots of the polynomial shown below?
f(x)=x2 + 2x2 – 117 - 12

Answer 1

x^3 +2*x^2 -11*x -12 = 0 =>

=> x^3 +2*x^2 -11*x -12 = 0

=> (x -3)*(x +4)*(x +1) = 0

the roots are 3,-4,-1

I just add them,

3+(-4)+(-1)=-2