So I have this math problem...

is -6 a root of....

x^3-5x^2-3x-18=0? yes or no?

i plug this equation in my calculator and go to the table. It says the coordinates are (-6,0) which means when I plug in -6, it should equal 0... However, when I do the work, I end up getting -183...

(-6)^3-5(-6)^2-3(-6)-18=0

-216 -5 +36 +18 - 18 =0

-216-5+36 = -183 @_@?

am I doing something wrong?