/sci/ - Science & Math

memorized to the tune of pop goes the weasle. x=[-b+- Sqrt(b^2-4ac)]/2a

>>1008148


Ah fuck you guys.

x = (-b + sqrt(b^2 - 4ac))/(2a) or (-b - sqrt(b^2 - 4ac))/(2a)

x= -b +- √ b^2-4ac/2a

>>1008157
You're technically incorrect, as you forgot about order of operations.

>>1008148
Post the mnemonic device please sir, I can never remember it.

>>1008170
Meh, I'm used to writing it by hand.

>>1008179
There's really no need for a mnemonic device; just complete the square for: ax^2 + bx + c = 0

>>1008179
How were you never taught this?
Tune: Pop Goes the Weasel
X equals negative B plus or minus the square root.
B squared minus 4 A C. All over 2 A.

>>1008190
That's how I learned it too :)

(ax^2 + bx + c) = 0
x^2 + b/ax + c/a = 0
x^2 + b/ax + b^2/4a^2 = -c/a + b^2/4a^2
(x + b/2a)^2 = - (b^2 + 4ca)/(4a^2)
x + b/2a = ± sqrt(b^2 + 4ac)/2a
x = [b ± sqrt(b^2 + 4ac)]/2a

Oh, I'm sorry, did you say you had 30 seconds to PROVE the quadratic formula?

Negative B plus or minus the square root of B squared minus 4AC over 2A.
All the mnemonic you need.

>>1008233
Nerd!