Factor 12x^2-21x^3

$12 x^{2} - 21 x^{3}$

Step 1

Factor $3 x^{2}$ out of $12 x^{2}$ .

$3 x^{2} (4) - 21 x^{3}$

Step 2

Factor $3 x^{2}$ out of $- 21 x^{3}$ .

$3 x^{2} (4) + 3 x^{2} (- 7 x)$

Step 3

Factor $3 x^{2}$ out of $3 x^{2} (4) + 3 x^{2} (- 7 x)$ .

$3 x^{2} (4 - 7 x)$