2.4k views
5 votes
21x^2-2x-3. Factor by grouping (ac method)

1 Answer

1 vote
rewrite -2x into 7x-9x
21x^2+7x-9x-3
group the first two terms, then group the last two terms: (21x^2+7x)-(9x+3)
7x(3x+1)-3(3x+1)
so (3x+1)(7x-3)
User Whostolebenfrog
by
7.3k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories