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Maths help! I need mathematicians: 10/21/2013 19:01:07


Mudderducker 
Level 57
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I'm geting really confused with Solving quadratic using the Formulae (Alegbra) can someone please explain step to step of how to do it but also what I mostly want is, what u type in on the calculator. So if anyone can work this out I will be very happy and thankful.

Here's an example question:

1.Xsquard+10X+6=0

2.2Xsquard-7X+4=0
Maths help! I need mathematicians: 10/21/2013 19:10:07

CROivan
Level 46
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What do you mean by Xsquard? X^2 maybe? If so, I can help

Edited 10/21/2013 19:17:50
Maths help! I need mathematicians: 10/21/2013 19:30:46


Mudderducker 
Level 57
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I meant X( miny 2 ) which is squared, I couldn't be bothered to get the sign. However due to my amazing concentration and determination, I managed to work it out for myself. This thread was a sign of me panicking and being confused. Thanks
Maths help! I need mathematicians: 10/21/2013 21:27:31


Moros 
Level 50
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1. x=-0,641 V x=-9,359
2. x=11,123 V x=2,877

Did I get it right?
Maths help! I need mathematicians: 10/21/2013 21:30:31


Timinator • apex 
Level 64
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X² ist pretty hard to type...
Maths help! I need mathematicians: 10/21/2013 21:45:24


Mudderducker 
Level 57
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Do keyboards have X²?

@Moros, I believe that is correct if I'm right.
Maths help! I need mathematicians: 10/21/2013 22:47:17


Gnullbegg 
Level 49
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not wahr...
Maths help! I need mathematicians: 10/22/2013 01:22:07

Jehovah 
Level 58
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apollo, i gave you some wl tution, time for math tution....

use this formula


lets take your first question

x^2 + 10x + 6

here the 'X^2' is a, '10x' is b, and '6' is c.

substitute those into the equation...

'-10+√10^2-4*1*6' / 2*1
and
'-10-√10^2-4*1*6 / 2*1

so...

(-10+√100-24) / 2

jam it all into your calculator, if you have one of those shitty ones from the6 60s, thats too bad,
you get your first answer -0.64

than...

(-10-√100-24) / 2

you get your other answer -9.35'

Love,

Someone's who younger than you ;)

a.k.a THE BRAINIAC and the mathemagician!!!

Edited 10/22/2013 02:05:54
Maths help! I need mathematicians: 10/22/2013 01:54:38


nich 
Level 59
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It would be more accurate to say a is the 1 from '1 * x^2' and b is the 10 from '10x'

For those unaware the carat ^ is the same as saying 'to the power of' e.g. 2^3 is 2 cubed = 2*2*2=8 (and * is times). Aside from being generally handy to know this is useful if you ever do any programming etc.
Maths help! I need mathematicians: 10/22/2013 04:52:53


Pushover 
Level 59
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Plugging numbers into a formula is not math. :/

On the other hand, deriving that formula is! :D

http://www.1728.org/quadr2.htm
Maths help! I need mathematicians: 10/22/2013 05:08:30

Seahawks 
Level 51
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http://www.ted.com/talks/arthur_benjamin_does_mathemagic.html, pretty beautiful work, also program your calculator with the quadratic formula, it is very helpful
Maths help! I need mathematicians: 10/22/2013 05:13:26

Seahawks 
Level 51
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brain what did you get on last years amc 8/10/12???
Maths help! I need mathematicians: 10/22/2013 08:37:59

Jehovah 
Level 58
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what a typical american.

not everyone lives in america, seahawks.
Maths help! I need mathematicians: 10/22/2013 11:05:01


Pink 
Level 60
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not as a criticism, apollo, how old are you?
Maths help! I need mathematicians: 10/22/2013 22:52:01


Z-Dog 
Level 54
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Have you made AIME seahawks?
Maths help! I need mathematicians: 10/23/2013 02:30:43

Seahawks 
Level 51
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i took AMC 10 last year and would have made AIME had i not missed number 2... :(
Maths help! I need mathematicians: 10/23/2013 13:36:30

Jehovah 
Level 58
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seahawks shouldnt you be off the forum?
Maths help! I need mathematicians: 10/24/2013 00:22:00

☾☀★Vielle★☀☽
Level 12
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look it up or beter yet us a calaculator u dumbcunnt

Edited 10/24/2013 00:22:09
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