Thread: Expanding/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!

Originally Posted by Constance

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!

There is an x term! FOIL. First, Outer, Inner Last.

This gives us . This is a special expansion called the difference of squares.

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!