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  #1  
Old 12-20-2005, 03:02 PM
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Default Quadratic Equation

I just realized I completely forgot this, does anybody know it. Thanks.
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  #2  
Old 12-20-2005, 03:07 PM
felson felson is offline
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Default Re: Quadratic Equation

Google is your friend.
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  #3  
Old 12-20-2005, 03:08 PM
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Default Re: Quadratic Equation

(-b +/- sqrt(b^2 -4ac)) / 2a
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  #4  
Old 12-20-2005, 04:18 PM
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Default Re: Quadratic Equation

ty
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  #5  
Old 12-20-2005, 07:26 PM
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Default Re: Quadratic Equation

I will never forget that formula as long as I live.

Morphball...why in the hell did you need the quadratic equation may I ask?
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  #6  
Old 12-20-2005, 08:15 PM
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Default Re: Quadratic Equation

A helpful way to remember it is to the tune of Pop Goes the Weasel.

"x equals negative b
plus or minus square root
of b squared minus four a c
all over 2a"
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  #7  
Old 12-20-2005, 10:20 PM
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Default Re: Quadratic Equation

[ QUOTE ]
A helpful way to remember it is to the tune of Pop Goes the Weasel.

"x equals negative b
plus or minus square root
of b squared minus four a c
all over 2a"

[/ QUOTE ]

Coincidence?

If anyone needs me I'll be in my bomb shelter.
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  #8  
Old 12-21-2005, 11:04 AM
chezlaw chezlaw is offline
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Default Re: Quadratic Equation

[ QUOTE ]
I just realized I completely forgot this, does anybody know it. Thanks.

[/ QUOTE ]
No need to remember, just complete the square.

ax^2 + bx + c = 0
x^2 + (b/a)x = -c/a
(x + (b/2a))^2 - b^2/4a^2 = -c/a [complete the square]
x + b/2a = sqrt(b^2/4a^2 - c/a)
tidy up and get [its tough typing this stuff]
x = ( -b +- sqrt(b^2 - 4ac) ) /2a

Strangly after years I can remember that with no trouble but cant remember the formula.

chez
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  #9  
Old 12-21-2005, 01:37 PM
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Default Re: Quadratic Equation

I need it to calculate the trajectory of certain biological eruptions...you just can't go on with life unless you know, you know?
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  #10  
Old 12-21-2005, 02:08 PM
soko soko is offline
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Default Re: Quadratic Equation

solve(f(x),x)
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