Question

Find all zeros of x^3-x^2-11x+15.

I already know that one zero is 3, if that helps at all.

Answer 1

Hmm I always forget how to do these by grouping...
If you're sure that 3 is a root, then it means (x-3) should divide out evenly from this polynomial.
Are you familiar with

Polynomial long division
OR
Synthetic division
?

Answer 2

Synthetic is preferred.

Answer 3

k cool c:

Answer 4

OH. i understand already now:) thank you so much!

Answer 5

oh hah cool c: