Question

Completely factor.
x^4 + 3x^3 + 4x^2 + 12x = 0​

Answer 1

x⁴ + 3x³ + 4x² + 12x = 0

<=> x³(x + 3) + 4x(x + 3) = 0

<=> (x³ + 4x)(x + 3) = 0

<=> x(x² + 4)(x + 3) = 0