Question

Factor completely 2x^3 + 14x^2 + 6x + 42.

Answer 1

Hello,

2x^3+14x^2+6x+42=2x^2(x+7)+6(x+7)
=(x+7)(2x²+6)
=2(x+7)(x²+3)  in IR.

or In C  2(x+7)(x-i√3)(x+i√3)