Charles F. answered • 12/29/14
Tutor
4.3
(10)
Electrical and Biomedical Engineer- Great in the Sciences
(5a-1) (3a+3a+3) First add common numbers (3a+3a)
=(5a-1)(6a+3) Next write out each multiplication
Using FOIL (First Outer Inner Last)
=(5a*6a)+(5a*3)+(-1*6a)+(-1*3) Then multiply
=(30a2) + (15a) + (-6a) + (-3) Then add common
= 30a2+9a-3
