Alright. I do not know the answer to this question, and need to know.

If you were to expand (x-7)(x+7) there would be no x-term. Explain this!

Please someone help!

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- January 17th 2006, 03:03 PMConstanceExpanding/Factoring Q.
Alright. I do not know the answer to this question, and need to know.

If you were to expand (x-7)(x+7) there would be no x-term. Explain this!

Please someone help! - January 17th 2006, 03:33 PMJamesonQuote:

Originally Posted by**Constance**

This gives us . This is a special expansion called the difference of squares. - January 17th 2006, 03:35 PMdud
I suppose you mean to expand this, there would be no x in the first order.

This last one there is a theorem/rule which I don't know what is called in English.

Which gives.

There you have it, no x of first degree! :)