5√ [12xm^3 ] =
5 √12 * √x * √m^3 =
5 * √4 * √3 * √x * √m^3 =
5 * 2 * √3 * √x * m√m =
5 * 2 * m √ [ 3 * x * m ] =
10m √ [3xm ]
7√28 - 5√63 =
7√[4 * 7] - 5√[9 * 7 ] =
7 * √4 *√7 - 5 *√9 * √7 =
7 * 2 * √7 - 5 * 3 * √7 =
14√7 - 15√7 =
-√7
2 √7 2√7
__ * ___ = ___
√7 √7 7
