hey there..

The question is..

lambda = x (i dont know how to type the symbol..)

Let A be n x n square matrix. Suppose that

det(xI-A) = c(x) = x^3- 3x^2 + x + 6..

I know the answer is -6 by substitute lambda@x with 0..

However.. i just want to know.. why should i substitute it with 0..?

Thanks in advance..