November 21, 2011

Hi class:)
I´m going to talk about today class.
First we have corrected our yesterday homework that was exercise number 55.Then Mario has explained us how to remove the common factor: we can remove the common factor to a polynomial expression in order to get an easier one.
This is an example: $$4x^{2}y+2xy-4xy^{4}=2xy(2x+1-2y^{3})$$
it means the you have to found one common factor on the polynomial and then you have to divide the polynomial between the common factor.

And after that Mario has explained to us the remarkable identities.
Example: $$(a+b)^{2}=(a+b)(a+b)=a^{2}+ab+ba+b^{2}=a^{2}+b^{2}+2ab$$
the explanation of the result of the operation is that you have to multiply all the factors by each other , it means that: $(a \cdot a) + (a \cdot b) + (b \cdot a) + (b \cdot b) = a^{2} + b^{2}+2ab$

I hope you have understood it.


  1. Good post!!!!!!!!!!!!! You are a little lat, but it´s not important!!!!!!!!!!!

  2. OMG!!! An incredible work you've done here!!

    Congratulations Silvia!! Was it difficult to you to use the LaTeX symbols? I guess you haven't found any trouble at all ;)

    I'm editing your entry to add the proper multiplication symbol, ok? It's written "\cdot" (center dot) ^_^

    Also, if you prefer to write the maths expressions in a different line, you should write twice the $ symbol ;)

    Well Dooooooooooooooone!!!

    A New Challenge of the Week will be posted next Thursday. I'll include last challenge solution ;D

  3. jajaj you get bored a lot MArioooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo Today´s classs was perfect!!!!!!!!!!!!!!!!!

  4. Thank you Mario, it wasn´t difficult at all to do but it was very tired, because you have to put a lot of strange symbols but at the end i found it easier than at the beginning

  5. really??????????????? No, it´s imposible!!!!!!!!!!!!!!!!!!!

  6. I know silvia, but all those symbolls won't seem strange to you anymore ;)

    Now you know how to use LaTeX in our blog! Congrats! :D