Multiplying Matrices

So today in algebra class, we learned how to multiply matrices. It's acually pretty easy. I was kind of fuzzy on it at first, but then once I started to retrace the steps and connet all the dots, it was SO EASY. Down side to it was that it took a long, long, long time. So again, I'm gonna just show you:

Determinents

So today in class we kept on learning about matrices and determinents. Turns out its too hot to work outside on the garden. But I hope we start on it soon because it will get more students to participate and actually look forward to school...maybe. Anyways we worked on matrices and equations. Its basically just finding "x" and "y" and solving the problem. Again, it's hard to explain so I'll just show you:

It's hard to get at first,but once you really sit and stare and think about it, it starts to make sense.

More Matrices...

Well, we have another day of matrices. Actually today was more easy to learn. One new thing we learned today was that equal matrices are matrices with the same dimension and elements. Pretty easy right? But nooooooo. After going through that, we have to find the determinant. What we do is we add the matrices together then we take the matrix and then we mulitply diagonally and then subtract the two products and we get the deterimant. Wait, what?

Matrices

Today in class we learned about matrices. They're pretty easy to do and kind of simple really. All you is match and add/subtract/multiply/divide.Also, we're gonna start a garden at the school! You're probably like, Dude what does a garden have to do with math? It actually has a lot to do with math. With how big you should make it, how many plants would fit in it, etc. We're gonna start on Monday and it's Texas. It's gonna be one HOT day.

Substitute

Another day with relations and functions. But mainly today we worked on equations and substituting in the variables. It's kind of hard for me to explain so I'll just show you.


EX:                   
               f(x) = 4x² - 2(x) + 5                                           
                                        f(4)


So all we had to do was replace all the "x's" with a four and solve it. So if you do the math correctly, the answer is 61.Just when I think I got the hang of it...the negatives come. Its still confusing my mind. I hate it so much that if i ever see it, I just skip it. Who wants to be a negative anyway? Positive is the way to go! 

Function Notation & Vertical Line Test

We continued learning about relations and functions today. This time though, Mr. S taught us a new way to know if the relation is a function by something called the vertical line test. Basically, if you draw a line going vertically on the graph of the relation and it crosses two different points, then the relation is not a function. Then he taught us about function notation. Saying that "f(x)" is "y". So everytime I see this: "f(x)" I know its "y". And there's a quiz coming up on Friday. For some wierd reason, I have a really bad feeling about it...

Relations and Functions

Today in class we talked about relations and functions. We also learned that a function table is almost like an input output table and kind of is. The "x" or domain is the input and the "y" or range is the output. It took me a while to get it at first, but I'm sure I've got the hang of it now. Except the whole integers thing throws me off. Oh negatives, why are you so confusing? If only I could find the cheat sheet Mr. S gave us last year. WHERE ARE YOU CHEAT SHEET?!?!