Question 586029



12ab - 30b + 4a^2 - 25b^2 


(12ab - 30b) + (4a^2 - 25b^2)


6b(2a - 5) + (4a^2 - 25b^2)


6b(2a - 5) + (2a-5b)(2a+5b)


and this is as far as you can go. Make sure that there are no typos.