If f(x) = x^3 − 2x^2 + x − 6, what is f(2)?

解說

f(2) = 8 − 8 + 2 − 6 = −4. The remainder when f(x) is divided by (x − 2) is therefore −4, so (x − 2) is not a factor. The value 0 would mean that it was a factor.