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How do you factor #9z^2 + 27z -az - 3a#?

1 Answer

May 8, 2015

We can factor this expression by making groups of 2 terms:

#(9z^2 + 27z) -(az + 3a)#

#9z# is common to both the terms in the first group, and #a# is common to both the terms in the second group

# = 9z(z+3) - a(z+3)#

#z+3# is common to both the terms now

#= color(green)((z+3)(9z-a)#

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