Question and answer
Find the product of this expression. (x + 3y)(x - 3y)
(x + 3y)(x - 3y) = x^2 - 3xy + 3xy - 9y^2 = x^2 - 9y^2
Question
Asked 3/7/2015 2:08:26 PM
Updated 3/14/2015 12:10:34 AM
6 Answers/Comments
Edited by Andrew. [3/13/2015 11:58:07 PM]
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(x^3y)(x^-3y)
= x^3y*1/x^3y
= y^2
Added 3/13/2015 11:48:42 PM
This answer has been flagged as incorrect.
Flagged by Andrew. [3/13/2015 11:59:58 PM]
3
(x + 3y)(x - 3y)
= x^2 - 3xy + 3xy - 9y^2
= x^2 - 9y^2
Added 3/13/2015 11:59:09 PM
This answer has been confirmed as correct and helpful.
Comments
janezeshun, the question is not written that way. It has only missing (+) symbol.
Added 3/14/2015 12:00:36 AM
But it didn't showed in the equation . It is easy to mislead us .
Added 3/14/2015 12:06:00 AM
I know it didn't show in the original question, but it is clear that (+) is missing because (-) is showing, Also, you should not assume that (x - 3y) means x^3y. I have answered this question many times before, and I'm pretty sure you have also answered this question before.
Added 3/14/2015 12:10:34 AM
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