Pre-Algebra Examples

$7 b^{2} - 21 a b$

Step 1

Factor $7 b$ out of $7 b^{2}$ .

$7 b (b) - 21 a b$

Step 2

Factor $7 b$ out of $- 21 a b$ .

$7 b (b) + 7 b (- 3 a)$

Step 3

Factor $7 b$ out of $7 b (b) + 7 b (- 3 a)$ .

$7 b (b - 3 a)$

$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$