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forestcove
Nov 7, 2009, 09:12 AM
How do I work 9g-rm-9m+rg

Unknown008
Nov 7, 2009, 10:40 AM
Do you have to factorise?

Group what you see are similar in any two terms.

For example, if you had ab + because + cd, you could see that the first two have be in common, or the last two have c in common. Two different ways are:

b(a+c) + cd --or-- ab + c(b+d)

Try doing the same for your question.