Asked by Jane
Please can you expand and simplify the following:
(2x-5)(x+3)
Many thanks.
Happy New Year
(2x-5)(x+3)
Many thanks.
Happy New Year
Answers
Answered by
drwls
Learn 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
(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
Answered by
chelsea
surely, it would be x^3-2x-15
please correct me if i'm wrong
please correct me if i'm wrong
Answered by
drwls
Chelsea is wrong. Only the -15 term is correct. There is no cubic (x^3) term
Answered by
Jane
i 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.
Answered by
drwls
What 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.
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.
Answered by
drwls
The answer you should get is
2x^2 +x -15
2x^2 +x -15
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