View Full Version : complete the square

Back in Black

12-09-2005, 10:41 AM

Problem: X squared - 2x - 2 = 0

solution: x squared - 2x = 2

x squared - 2x + 1 squared = 2 + 1 squared

(x-1)squared = 3

x - 1 = 1

x = 1 + or - the square root of 1

Thats how we complete the square. I just made you guys 10 times smarter.

Bacterium

12-09-2005, 10:48 AM

I don't really get it... :o

Back in Black

12-09-2005, 10:49 AM

Take advanced Algebra and then you'll know.

Bacterium

12-09-2005, 10:52 AM

Problem: X squared - 2x - 2 = 0

solution: x squared - 2x = 2

x squared - 2x + 1 squared = 2 + 1 squared

(x-1)squared = 3 How can you take away 2x?

x - 1 = 1

x = 1 + or - the square root of 1

Thats how we complete the square. I just made you guys 10 times smarter.

I've just done that at my math class, but I don't get it anyway..

Back in Black

12-09-2005, 10:54 AM

I don't know why we take away the 2x. I just know how to solve the problem.

Bacterium

12-09-2005, 11:01 AM

Problem: X squared - 2x - 2 = 0

solution: x squared - 2x = 2

x squared - 2x + 1 squared = 2 + 1 squared

(x-1)squared = 3

x - 1 = 1

x = 1 + or - the square root of 1

this is my solution:

x squared - 2x - 2 = 0

x squared - 2x = 2

X1: x squared = 2

X1 = the square root of 2

X2: 2x = 2

X2: 2x/2 = 2/2

X2 = 1

Back in Black

12-09-2005, 11:04 AM

this is my solution:

x squared - 2x - 2 = 0

x squared - 2x = 2

X1: x squared = 2

X1 = the square root of 1

X2: -2x = 2

X2: -2x/-2 = 2/-2

X2 = -1

Stop confusing me. I have a test on this today and I need to get at least a B on it.

Bacterium

12-09-2005, 11:05 AM

oh, then I'm sorry if I confused you!! :o there's a lot of different ways to find out what X is..

Good luck then!! :)

Endymion

12-09-2005, 11:57 AM

a) it's commonly denoted either x^2 or x**2

b) that is no where near what anyone but a retard could call 'advanced' algebra.

Sin Studly

12-09-2005, 12:04 PM

Even I could do that without the slightest bit of trouble, and I never made it past 10th grade, and never even showed up to maths back then. You suck.

Tired_Of_You

12-09-2005, 12:09 PM

b) that is no where near what anyone but a retard could call 'advanced' algebra.Exactly what I was going to say. I was not good at all in maths when I was in high school and algebra was much more difficult than that.

Endymion

12-09-2005, 12:21 PM

also, the roots of that are 1+sqrt(3) and 1-sqrt(3)

the correct way to complete the square would be:

x^2 -2x -2 = 0

(x-1)^2 -3 = 0

(x-1)^2 = 3

x-1 = +/- sqrt(3)

x = 1 +/- sqrt(3)

way to fuck up first grade math. if you're lucky you'll be working at subway well into senility.

XYlophonetreeZ

12-09-2005, 12:24 PM

Beat me to it.

Wishomie, you just made me ten times dumber. After Endy failed to point that out the first time I was questioning whether the square root of three somehow became one overnight.

Bacterium

12-09-2005, 12:27 PM

oh yeah.. i think this way is easier:

x^2-2x-2=0

x=2/2+/-sqrt(4/4+2)

x=1+/-sqrt(3)

Endymion

12-09-2005, 12:28 PM

Beat me to it.

Wishomie, you just made me ten times dumber. After Endy failed to point that out the first time I was questioning whether the square root of three somehow became one overnight.

at first i just looked at the first line and skipped over everything because i (incorrectly) assumed wishomie wasn't so fucking stupid that he couldn't do math my dog can.

T-6005

12-09-2005, 12:37 PM

Completing the square, huh?

That was easily amongst the top 3 easiest things we learned in high school math. Even compound interest is more difficult than completing the square, man.

And yet, you did it wrong.

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