Question

x三次方+6x平方+11x+6因式分解

Answer 1

x^3+6x^2+11x+6
=(x^3+6x^2+9x)+(2x+6)
=x(x^2+6x+9)+2(x+3)
=x(x+3)^2+2(x+3)
=(x+3)[x(x+3)+2]
=(x+3)(x+2)(x+1)