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post #1 of 26 (permalink) Old 07-01-2011, 02:10 PM Thread Starter
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i-root?

So I am going into Honors Algebra next year, so to prepare now I started to watch some Algebra 2 videos on youtube. Well I am skipping Algebra and going straight to Algebra 2, and watching some of these videos, I don't know what they are talking about. I understand everything, just some terms mess me up like the i-root. I tried googling it but I can't find an answer, so if you could please explain to me what an i-root is in Algebra 2 that would be great! Thanks! P.S. I'm going into my freshman year of High School if it matters. Example, in the yourteacher.com video for imaginary numbers advanced, a problem was (-7i[square root symbol]2)^2 Well I followed the whole video easily and got the answer right in my head, but whenever she would say i-root 2 I would be like WTF.


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post #2 of 26 (permalink) Old 07-01-2011, 02:37 PM
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No number squared can be negatuive. This is because any positive number times itself is positive and any negative number times itself (a negative times a negative) is also positive. A negative times a positive is the only way to multiply two numbers and get a negative.

'i' (and sometimes it's written as 'j' in upper level math class) is simply a way to denominate a number that when squared IS negative number. i^2 = -1. But if you solve for i, i = sqrt(-1) which isn't a real number.

If you ever become an electrical engineer, these become very important because EE's use it for representing different concepts in AC power (the power in your house) becaue AC power is phase dependent based on the phase of the current and voltage (these vary).

All you need to know is i^2 = -1. Or that i = sqrt(-1) ... the same thing, just square or square root both sides to go back and forth.

If a problem asks you to solve for sqrt(-5)= ?

Well, sqrt(-5) = sqrt(5 * -1) = sqrt(5)*sqrt(-1) ... but sqrt(-1) = i

So the answer is sqrt(5)*i
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post #3 of 26 (permalink) Old 07-01-2011, 02:42 PM
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get a fucking life - its summertime... go try and dive in some pussy or something
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post #4 of 26 (permalink) Old 07-01-2011, 02:51 PM
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Originally Posted by CheeseForSteeze View Post
No number squared can be negatuive. This is because any positive number times itself is positive and any negative number times itself (a negative times a negative) is also positive. A negative times a positive is the only way to multiply two numbers and get a negative.

'i' (and sometimes it's written as 'j' in upper level math class) is simply a way to denominate a number that when squared IS negative number. i^2 = -1. But if you solve for i, i = sqrt(-1) which isn't a real number.

If you ever become an electrical engineer, these become very important because EE's use it for representing different concepts in AC power (the power in your house) becaue AC power is phase dependent based on the phase of the current and voltage (these vary).

All you need to know is i^2 = -1. Or that i = sqrt(-1) ... the same thing, just square or square root both sides to go back and forth.

If a problem asks you to solve for sqrt(-5)= ?

Well, sqrt(-5) = sqrt(5 * -1) = sqrt(5)*sqrt(-1) ... but sqrt(-1) = i

So the answer is sqrt(5)*i
This is why I hate math, shit does not follow a system of logic but rather a unique concocted method for each desired outcome.

I second ShredLife's notion.

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post #5 of 26 (permalink) Old 07-01-2011, 04:42 PM Thread Starter
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This is why I hate math, shit does not follow a system of logic but rather a unique concocted method for each desired outcome.

I second ShredLife's notion.
But it makes perfect sense to me. I actually like math and learning new things. Besides, it's preparing me for the rest of my life so I really can't loose. And of course I would like some pussy, but I'm not worried, it will come eventually ^_^


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post #6 of 26 (permalink) Old 07-02-2011, 08:36 AM
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This is why I was 98th percentile in verbal on my SATs and functionally retarded in the math section.

In the end, I became a writer and the only time I use math is when I tip.

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post #7 of 26 (permalink) Old 07-02-2011, 09:54 AM Thread Starter
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This is why I was 98th percentile in verbal on my SATs and functionally retarded in the math section.

In the end, I became a writer and the only time I use math is when I tip.
Haha. The tip is to just not get overwhelmed. No matter how hard or confusing it is, just say its easy and look over the formula in sections 3-4 times. You will get it, I promise! Anybody can write, but only the few can understand the mathematical language ^_^ I am a really good writer, but I am also good with numbers. My only concern is what job I can get. I only plan for the future =P Once I have a good income of a minimum of 13k+ a month(my goal is to beat my parents, that's kinda our motto) I will be able to take a breather.


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post #8 of 26 (permalink) Old 07-02-2011, 10:05 AM
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My only concern is what job I can get. I only plan for the future =P Once I have a good income of a minimum of 13k+ a month(my goal is to beat my parents, that's kinda our motto) I will be able to take a breather.
you are the problem with this country.
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post #9 of 26 (permalink) Old 07-02-2011, 10:16 AM Thread Starter
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you are the problem with this country.
Meh I am religious and all and I know that money isn't everything, I just want my kids to have a better life then I did.


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post #10 of 26 (permalink) Old 07-02-2011, 10:31 AM
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This is why I was 98th percentile in verbal on my SATs and functionally retarded in the math section.

In the end, I became a writer and the only time I use math is when I tip.
This is me as well, which is why I'm naturally biased to hate math. I'm actually not that bad at math, I just can't stand doing it.

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