How do you factor #-36w -wu + 9u + 4w^2#?

1 Answer
Don't Memorise
May 24, 2015

#-36w - wu +9u +4w^2#

We can make groups of two to factorise this expression:
#(-36w +9u) +(-wu +4w^2)#

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

We can write the expression as :
#9(-4w +u) -w(-4w +u)#

#=color(green)((9-w)(-4w+u)#

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