How do you factor by grouping #3x^2 - 2x - 15x + 10#?

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Don't Memorise
May 22, 2015

#3x^2 - 2x - 15x + 10#

We can make groups of two to factorise this expression:
#(3x^2- 15x) + (-2x +10)#

#3x# is common to both the terms in the first group, and #-2# is common to both the terms in the second group

We can write the expression as :
#3x(x - 5) - 2(x - 5)#
#=color(green)((3x - 2)(x - 5)# , is the factorised form.

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