Question

What is the sum of the roots of the polynomial shown below?

Answer 1

1st check
x=1 is one of the roots
because f(1)=0
so divide by (x-1)

Answer 2

if you divide it by (x-1)
you will have (x-10)(x+3)

so roots are 1,-3,10

Answer 3

so it would leave me with 8?

Answer 4

Thank you so much!