Question 151402
[a – b(3- 4a)] – 6a[2-a(3-b)] 

Simplifying [a – b(3- 4a)] – 6a[2-a(3-b)] 

Reorder
 8[a – 3b+ 4ab] – 6a[2-3a+ab]
                               
= [8a – 24b+32ab] – [12a-18a^2+6a^2b]
= 8a – 24b+32ab – 12a+18a^2-6a^2b
= –24b+32ab-4a+18a^2-6a^2b