How do you factor #6ab − 8a + 21b − 28#?
1 Answer
Jul 18, 2016
Explanation:
Notice that the ratio between the first and second terms is the same as that between the third and fourth terms.
So this will factor by grouping:
#6ab-8a+21b-28#
#=(6ab-8a)+(21b-28)#
#=2a(3b-4)+7(3b-4)#
#=(2a+7)(3b-4)#
