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4m +4 - 6 + 9m

29 March 2011

= 13m -2

29 March 2011

First of all the brackets need to be expanded. We can do this by multiplying the first bracket by 4, and the second brackets by -3 like so:
Simplifying each bracket becomes:
Now we need to deal with the negative sign on the second braket (we could have taken care of this in the first step, but for clarity I have broken it up a bit more). So the sum could also be written like this:
Remember; when a negative is multiplied with another negative it becomes positives, when a negative is multiplied with a positive it becomes negative. So we get:
Now we just need to sum up the numbers and the m's to give:
Now we can simplify it to give the answer:
Hope that helps!

30 March 2011

Sorry, the first part should read "We can do this by multiplying the first bracket by 4, and the second brackets by 3 like so"

30 March 2011

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