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Difference of two functions

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by AleksandrM » Sat May 24, 2008 5:07 am
Tried this one twice. Couldn't get it. The 3s just keep cancelling out on me.
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by Mavin » Sat May 24, 2008 5:24 am
The answer is 2ab.

On substituting 'b' all other terms will be cancelled except 'ax'.

This will be:

a(b) - a(-b) = 2ab

Hope this helps.
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by AleksandrM » Sat May 24, 2008 11:19 am
Yup. Thanks. I tried it tried it again while doing a bunch of problems from the OG and realized that I overlooked the squaring, which makes -b positive. Have to be more careful.
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