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## #1 2012-09-23 15:47:45

SuperLynx
Member
Registered: 2009-06-28
Posts: 335

### Understanding Trig and Algebra

Hi. I'm looking for some help in understanding Trigonometry and Algebra. Specifically, vectors, matrices & scalars.  I hope someone can help me, I have searched on the subject, although nothing I could understand.  How do you multiple vectors, what is a dot product, I suppose best to start with that, I've already begun learning, but any resource or your own personal explanation would be helpful.

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## #2 2012-09-23 19:15:09

bob bundy
Registered: 2010-06-20
Posts: 8,322

### Re: Understanding Trig and Algebra

hi SuperLynx

The MathsIsFun teaching pages cover the dot product.  I would recommend this:

http://www.mathsisfun.com/algebra/vecto … oduct.html

And at the bottom there are some "test yourself" questions.

Why not start there ?

Also, if you search my posts you'll find I've helped people in the past on vector topics.

Post here if there's still a difficulty.

Bob

Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

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## #3 2012-09-24 01:15:21

SuperLynx
Member
Registered: 2009-06-28
Posts: 335

### Re: Understanding Trig and Algebra

This is going to sound like a dummy, which I am since I have forgotten some of this stuff.  Do you know any real basics teachings so I can build from that ?

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## #4 2012-09-24 05:44:56

bob bundy
Registered: 2010-06-20
Posts: 8,322

### Re: Understanding Trig and Algebra

hi SuperLynx

No dummy.  Everyone has to start somewhere.  But how basic do you want?   (see diagram)

Bob

Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

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## #5 2012-09-24 11:40:21

SuperLynx
Member
Registered: 2009-06-28
Posts: 335

### Re: Understanding Trig and Algebra

Isn't that vector 2,7 ?

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## #6 2012-09-24 19:40:00

bob bundy
Registered: 2010-06-20
Posts: 8,322

### Re: Understanding Trig and Algebra

hi SuperLynx

Vectors are used in many ways.  I was trying to show a movement vector of 6 across and 2 up.  That's why I put an arrow on the red line.  Sometimes vectors are written as a row rather than a column.  I prefer the column format because you don't have any confusion with coordinates.

Have a look at

http://www.bbc.co.uk/bitesize/higher/ma … evision/1/

Bob

Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

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