**Some Exercises on Factoring**

Factoring the followings

- 6
*ab*^{3}+3*a*^{2}*b*^{4}-9*a*^{2}*b*^{2} - (Difference of Squares)

Sum and Difference of Cubes

Evaluating the following expressions by using a proper formula. (Recall 15^{2},25^{2},35^{2},45^{2}, and etc.)

- (use ).