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December 20, 2014

December 20, 2014

Posted by **Jane** on Friday, January 1, 2010 at 5:53am.

(2x-5)(x+3)

Many thanks.

Happy New Year

- Maths -
**drwls**, Friday, January 1, 2010 at 6:17amLearn and apply the FOIL method.

(First, Outside, Inside, Last)

That describes the pairs of terms that you must multiply and then add together.

http://www.algebrahelp.com/lessons/simplifying/foilmethod/pg2.htm

To learn algebra, you really need the practice doing this yourself

- Maths -
**chelsea**, Friday, January 1, 2010 at 6:29amsurely, it would be x^3-2x-15

please correct me if i'm wrong

- Maths (chelsea) -
**drwls**, Friday, January 1, 2010 at 6:32amChelsea is wrong. Only the -15 term is correct. There is no cubic (x^3) term

- Maths -
**Jane**, Friday, January 1, 2010 at 6:38ami looked at the site, now i'm really confused, could you just show me the answer and working out, we haven't done the foil method in school we do it differently.

- Maths -
**drwls**, Friday, January 1, 2010 at 6:42amWhat you are doing in school must be the same thing, perhaps with a different name.

Why do you keep changing your name?

When you multiply the first pair you get

2x * x = 2x^2

That is the first term.

When you multiply the "inside" pair you get -5x

Now you do the others and combine terms.

- Maths -
**drwls**, Friday, January 1, 2010 at 6:50amThe answer you should get is

2x^2 +x -15

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