Question

3（x-1）的平方-18（x-1）+27 因式

Answer 1

3（x-1）的平方-18（x-1）+27

=3[(x-1)^2-6(x-1)+9]

=3(x-1-3)^2

=3(x-4)^2

=3(x+2)(x-2)