Question

x的三次方加5X加6 如何分解因式?

Answer 1

x^3+5x+6
=x^2(x+1)-x^2+5x+6
=x^2(x+1)-x(x+1)+6x+6
=x^2(x+1)-x(x+1)+6(x+1)
=(x+1)(x^2-x+6)