Question

计算 (x^2－2x＋3)(x－1)(x＋1)要过程

Answer 1

=(x^2-2x+3)(x^2-1)

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

=x^4-2x^3+3x^2-x^2+2x-3

=x^4-2x^3+2x^2+2x-3