The Mugen Fighters Guild - Time For Math!! (Level: Pre-Cal/Algebra)

Young Shimaiuskoo Doh

Time For Math!! (Level: Pre-Cal/Algebra)

#1 April 10, 2008, 09:02:22 pm

Gotta go fast!!

First of all, I know some of you chaps may be out of school and may not want to see another textbook until the next day...

Oh well!!

Are there any chaps in the Guild Academy, skilled in the ways of Mathematics, preferably Pre-Calculus and Algebra? Young Durr, here, is in need of some assistance and would love it if any of you Mathematical-chaps could lend him a hand...or foot...or nose...or dollar...whatever you can spare!

Signature by my pal, Signature Queen TempesT!!

Valodim

Re: Time For Math!! (Level: Pre-Cal/Algebra)

#2 April 11, 2008, 12:04:01 am

that is very vague. can you be more specific?

Young Shimaiuskoo Doh

Re: Time For Math!! (Level: Pre-Cal/Algebra)

#3 April 11, 2008, 01:02:40 am

Gotta go fast!!

I thought you chaps were waiting for me to post something...

Sorry about that!!
==================================================

Heres a problem:

3x³ = 3x² + 60x

My brain is on "Deeply Fried" right now, and would really like it if any chaps could help out!

Signature by my pal, Signature Queen TempesT!!

Valodim

Re: Time For Math!! (Level: Pre-Cal/Algebra)

#4 April 11, 2008, 01:07:39 am

3x³ = 3x² + 60x	\| /x
3x² = 3x + 60	\| -3x³
0 = -3x² + 3x + 60	\| *(-1) /3
0 = x² -x -20

Young Shimaiuskoo Doh

Re: Time For Math!! (Level: Pre-Cal/Algebra)

#5 April 11, 2008, 01:12:19 am

Gotta go fast!!

You are truly a legend, Valodim, truly a legend. (Young Footlecum Durr will grow to be like Valodim one day...)

Thanks, mate!!

I'll be returning to this thread from time to time if I have more questions!!

Actually, I have one, now!!

Have any of you chaps ever heard of Point-Interval Notation?

Signature by my pal, Signature Queen TempesT!!

hjk

Re: Time For Math!! (Level: Pre-Cal/Algebra)

#6 April 11, 2008, 01:23:26 am

Watch my fro grow as you go, go, go, go, go.

Valodim said, April 11, 2008, 01:07:39 am

3x³ = 3x² + 60x | /x
3x² = 3x + 60 | -3x³
0 = -3x² + 3x + 60 | *(-1) /3
0 = x² -x -20

Shouldn't that have been solved further (didn't read whole thread)

- I reformed the equation making it this
3x³ - 3x² - 60x = 0

- Then I factored out the "3x" leaving me with
3x(x² - x - 20) = 0

- Then I took out the "3x" (because it doesn't matter) and factored the rest
(x² - x - 20) = 0
(x-?) (x+?') = 0

5 * 4 = 20 so
? = 5 and ?' = 4
and that allows for a "0" answer

- Plug that in and you have this:
(x-5)(x+4)
(x² - x - 20)

- This would mean that when x = 5 or when x = -4 the equation equals zero (asx seen on a graph if I haven't made a mistake while typing)

**Check the answer by plugging the numbers (x = 5 or x = -4) into the original equation. I will do the same after finding a calculator.

LOL, Caddie's the man!!

I'm as real as the runnin, I just happen to rap, Nigaas London, Japan, and i'm scared of dat tap.

I suggest extending my banning, cuz when I come back, it's gonna be hell. You think I was annoying before, oh man, it's on now

hjk vs. 99% of MFG. I will win.

RIP Poo Bear Tell my Dead Homie isson, for the year my partner.

Young Shimaiuskoo Doh

Re: Time For Math!! (Level: Pre-Cal/Algebra)

#7 April 11, 2008, 01:28:16 am

Gotta go fast!!

Thank you very much, fellow Sonic-Avatar, Jango's Godzilla!!

The solutions "x = 5" and "x = -4" check perfectly!

I'm still trying to figure out the Point/Interval Notation part of it, but in the meantime, here's an inequality:

t² - 9t > 0

I'm thinking I should transpose the "9t" to the other side of the arrow and square both sides...just a guess...

Signature by my pal, Signature Queen TempesT!!

hjk

Re: Time For Math!! (Level: Pre-Cal/Algebra)

#8 April 11, 2008, 01:37:16 am

Watch my fro grow as you go, go, go, go, go.

Young Footlecum Durr said, April 11, 2008, 01:28:16 am

Thank you very much, fellow Sonic-Avatar, Jango's Godzilla!!
The solutions "x = 5" and "x = -4" check perfectly!

NP. Took this about 2 yrs ago (early for my age but my memory is usually bad)

Case in Point:

Young Footlecum Durr said, April 11, 2008, 01:28:16 am

I'm still trying to figure out the Point/Interval Notation part of it, but in the meantime, here's an inequality:
t² - 9t > 0
I'm thinking I should transpose the "9t" to the other side of the arrow and square both sides...just a guess...

I don't even remember. I'm tempted to bring the 0 over but then I can't remmber what to do with the "inequality."

I KNOW, however, that the answer is:
t < 0
t > 9
*unneeded*................ t != 0

LOL, Caddie's the man!!

hjk vs. 99% of MFG. I will win.

RIP Poo Bear Tell my Dead Homie isson, for the year my partner.

Last Edit: April 11, 2008, 01:43:28 am by Jango's GodZilla

Valodim

Re: Time For Math!! (Level: Pre-Cal/Algebra)

#9 April 11, 2008, 01:38:25 am

hjk: Yes, by using a regular quadratic formula. In case you never heard of that one - it's key to solving quadratic equations, and you will sooner or later be expected to know it. Learn it, now.

I never heard of Point/Interval Notation. I do know Interval Notation.
t² - 9t > 0
t - 9 > 0
t > 9

solution interval: { t | t > 9 }

alternate way of writing: (9, infinity]
Note here that the ( indicates an exclusive boundary, while ] means inclusive. so [3, 5) would mean 3 <= x < 5. You can use this in MUGEN, too:

trigger1 = time = [3, 5)

would trigger if time was 3 or 4, but not 5.

Last Edit: April 11, 2008, 01:41:32 am by Valodim

hjk

Re: Time For Math!! (Level: Pre-Cal/Algebra)

#10 April 11, 2008, 01:43:10 am

Watch my fro grow as you go, go, go, go, go.

Valodim said, April 11, 2008, 01:38:25 am

hjk: Yes, by using a regular quadratic formula. In case you never heard of that one - it's key to solving quadratic equations, and you will sooner or later be expected to know it. Learn it, now.

Yes, I know it. God, after sending that PM I slapped myself. I wasn't thinking properly while writing it and meant to put at the end that I think there is something that I'm not thinking about, or else I looked deeper into the equation than what was needed. Admittedly, I don't understand what you mean by making that post, BUT, I'm sure there is something that, again, I've neglected to think of.

Valodim said, April 11, 2008, 01:38:25 am

I never heard of Point/Interval Notation. I do know Interval Notation.
t² - 9t > 0
t - 9 > 0
t > 9
solution interval: { t | t > 9 }

Does my additional answer of "t < 0" check out as well?

LOL, Caddie's the man!!

hjk vs. 99% of MFG. I will win.

RIP Poo Bear Tell my Dead Homie isson, for the year my partner.

Last Edit: April 11, 2008, 01:47:42 am by Jango's GodZilla

Young Shimaiuskoo Doh

Re: Time For Math!! (Level: Pre-Cal/Algebra)

#11 April 11, 2008, 01:48:30 am

Gotta go fast!!

Seriously, chaps, if Harry Potter were a Math Wizard like you shipmates, his skills couldn't rival half of you guys.

How did you come to the conclusion of (9, infinity] without a number-line? (Open question to anybody.)

Signature by my pal, Signature Queen TempesT!!

Valodim

Re: Time For Math!! (Level: Pre-Cal/Algebra)

#12 April 11, 2008, 01:51:03 am

Ah whoops. you're right t < 0 is true as well.

t² - 9t > 0
t(t-9) > 0

one: /t
t-9 > 0
t > 9

two: /(t-9)
t < 0

The > becomes a < with that operation. Do not ask me what the specific conditions for that to happen are, I can't remember. It just fits in this case.

hjk

Re: Time For Math!! (Level: Pre-Cal/Algebra)

#13 April 11, 2008, 02:17:31 am

Watch my fro grow as you go, go, go, go, go.

Valodim said, April 11, 2008, 01:51:03 am

The > becomes a < with that operation. Do not ask me what the specific conditions for that to happen are, I can't remember. It just fits in this case.

Thanks Val. i'm going to see if some old texts of mine may give the answer to why that is.
Props my friend.

LOL, Caddie's the man!!

hjk vs. 99% of MFG. I will win.

RIP Poo Bear Tell my Dead Homie isson, for the year my partner.

Young Shimaiuskoo Doh

Re: Time For Math!! (Level: Pre-Cal/Algebra)

#14 April 11, 2008, 03:08:22 am

Gotta go fast!!

Thanks for your help so far, chaps, I really appreciate it!
=========================

Here's a Square Root version:

SqR(2x + 3) < 5

The SqR means "Square Root," and anything inside the parenthesis is in Square Root form. I don't know to post a Square Root...