Elemenrty Algebra. killin me

decavo · 07-03-09, 10:29 AM

Completing the square to solve a Quadratic Equation

Problem: X2 +4x = -1
X2 +4x +4 = -1+4

it is X squared BTW>>
Where does the 4 come from?
I am trying to get a jump on this crap cause

MATH SUCKS

bogus one · 07-03-09, 10:32 AM

take your shoes off

bogus one · 07-03-09, 10:33 AM

Call Corn.

He'll help you out and then laugh at you

bogus one · 07-03-09, 10:34 AM

you might want to take a basic spelling class as well

decavo · 07-03-09, 10:34 AM

Maybe I should do that... I never had this in school I was too busy cutting class chasing sluts...

decavo · 07-03-09, 10:35 AM

Quote:

Originally Posted by bogus one

you might want to take a basic spelling class as well

You should see how the teachers spell.

bogus one · 07-03-09, 10:36 AM

Quote:

Originally Posted by decavo

You should see how the teachers spell.

yeah, no kidding.

we redlined one of Corn's papers from school and sent it to the principal.

didn't get a warm response

Atticus · 07-03-09, 10:36 AM

Quote:

Originally Posted by decavo

Completing the square to solve a Quadratic Equation

Problem: X2 +4x = -1
X2 +4x +4 = -1+4
Where does the 4 come from?
I am trying to get a jump on this crap cause

MATH SUCKS

Are you telling me that you have a math problem that looks like this:

X(sq) + 4X = -1
X(sq) + 4X + 4 = -1 + 4

And you have to solve for X?

Since the 4 is on both sides of the equation, then it is meaningless. I have no idea where the 4 came from. It doesn't make any sense. You at least know that X has to be a negative number, because the result is negative.

Anyway, repost the equation in a way that makes sense, because I cannot really tell what the equation you are trying to solve is from how you wrote it. I don't know if X2 is "X squared" and if 4 [lower case X] is different from 4 [upper case X].

decavo · 07-03-09, 10:39 AM

X(sq) you cant make the little letters using mud and it does not translate over from word.

I fixed the first post so it would make better sense to everyone.

decavo · 07-03-09, 10:41 AM

Quote:

Originally Posted by RockerRash

They just added 4 to both sides of the eqn so that you can take the square root of both sides easily.

x=(3^.5) -2

In other words, x = radical 3 minus 2.

why use 4 ? that is my question. The problem is solved for me as an example. SO where did the 4 come from?

bogus one · 07-03-09, 10:42 AM

Quote:

Originally Posted by decavo

SO where did the 4 come from?

It was following the 3?

bogus one · 07-03-09, 10:44 AM

Quote:

Originally Posted by RockerRash

Because you can factor x^2 +4x +4 into (x+2)(x+2) or (x+2)^2 and then take the sq root of both sides of the eqn.

will you stop with the logic and just punch him in the balls already?

sheesh..............

cruiser88 · 07-03-09, 10:44 AM

The Order of Operations: PEMDAS

Atticus · 07-03-09, 10:44 AM

Quote:

Originally Posted by decavo

why use 4 ? that is my question. The problem is solved for me as an example. SO where did the 4 come from?

RockerRash edited his post to explain it better.

cruiser88 · 07-03-09, 10:45 AM

Order of Operations - PEMDAS

cruiser88 · 07-03-09, 10:46 AM

Solving Quadratic Equations: Solving by Factoring

decavo · 07-03-09, 10:47 AM

Quote:

Originally Posted by RockerRash

Because you can factor x^2 +4x +4 into (x+2)(x+2) or (x+2)^2 and then take the sq root of both sides of the eqn.

where does the + 4 come from?

cruiser88 · 07-03-09, 10:48 AM

check my last link it will show you what do to when factoring...switching side whatever

Quote:

Originally Posted by decavo

where does the + 4 come from?

decavo · 07-03-09, 11:01 AM

Cool I am reading already

wob · 07-03-09, 11:06 AM

x = -0.26794919243112270647255365849413

dieseldog · 07-03-09, 11:07 AM

Quote:

Originally Posted by decavo

Completing the square to solve a Quadratic Equation

Problem: X2 +4x = -1
X2 +4x +4 = -1+4

it is X squared BTW>>
Where does the 4 come from?
I am trying to get a jump on this crap cause

MATH SUCKS

It is a given that in any mathematical equation, you are allowed to do the same thing to both sides of the equality. In this case, they are adding a "4" to each side.

cruiser88 · 07-03-09, 11:08 AM

square root that fer me bitch

Quote:

Originally Posted by wob

x = -0.26794919243112270647255365849413

dieseldog · 07-03-09, 11:11 AM

Quote:

Originally Posted by decavo

where does the + 4 come from?

You use your head and see that the integer in front of the "x" term is also a "4"; therefore, if you add "4" to each side of the equality, you will likely be able to factor the quadratic in the manner that rockerrash has stated.