[High School - Algebra] Quadratic Equations

DJ_Okami · 03-2-2008, 02:19 AM

I need help with this question. I'm not sure how to start it off. Any help will be greatly apperciated:
Find the solutions to the following equation algebraically, and verify your solution(s).

0 = 3 - squareroot (x-3)

**dandandamdandan1111** · 03-2-2008, 02:32 AM

I'M REALLY BORED.

Step 1: 0=3-sqrt(X-3) Subtract 3 from both sides.
Step 2: -3=-sqrt(X-3) Square both sides.
Step 3: 9=-X+3 Subtract 3 from both sides.
Step 4: 6=-X Multiply both sides by -1 to find X.
X=-6

This is probably right lol.

EDIT: Lol, I took this last year in 7th grade.

**dore** · 03-2-2008, 02:53 AM

dunno where you got that negative in step 3

0=3-sqrt(x-3)
-3=-sqrt(x-3)
9=x-3
12=x

**foilman8805** · 03-2-2008, 02:56 AM

Hahaha, I was looking at dan's work and I was like...oooh! There's an i! How excit - oh. He did it wrong.

DJ_Okami, just to clarify, dore's post is the correct answer.

~kitty~ · 03-2-2008, 09:55 AM

Quote:

Originally Posted by DJ_Okami

I need help with this question. I'm not sure how to start it off. Any help will be greatly apperciated:
Find the solutions to the following equation algebraically, and verify your solution(s).

0 = 3 - squareroot (x-3)

wow, that's easy

Relambrien · 03-2-2008, 12:30 PM

Here's a bit of a more in-depth explanation

0 = 3 - root(x-3) ------------ Given in problem
-3 = -root(x-3) ------------ Subtract three from each side
9 = x-3 --------------------- Square each side (the -root is irrelevant in terms of squaring, as it just denotes the negative square root rather than the positive, and ends up squaring to the same thing)
12 = x ---------------------- Add three to both sides.

**dandandamdandan1111** · 03-2-2008, 12:32 PM

Lol. I had 12 as my first answer, then I did it and got -6 for some reason. If I had done it on paper, I probably would've gotten it.

DJ_Okami · 03-2-2008, 01:13 PM

thanks guys, i suck at math...

03-2-2008, 02:19 AM	#1
DJ_Okami FFR Player Join Date: Feb 2007 Location: in the corner of my round room Age: 34 Posts: 2	[High School - Algebra] Quadratic Equations I need help with this question. I'm not sure how to start it off. Any help will be greatly apperciated: Find the solutions to the following equation algebraically, and verify your solution(s). 0 = 3 - squareroot (x-3) __________________ screw this

03-2-2008, 02:32 AM	#2
dandandamdandan1111 the baker man Join Date: Jun 2007 Location: merryland Age: 30 Posts: 2,176	Re: High school Jr. Algebra Quadratic Equations I'M REALLY BORED. Step 1: 0=3-sqrt(X-3) Subtract 3 from both sides. Step 2: -3=-sqrt(X-3) Square both sides. Step 3: 9=-X+3 Subtract 3 from both sides. Step 4: 6=-X Multiply both sides by -1 to find X. X=-6 This is probably right lol. EDIT: Lol, I took this last year in 7th grade. Last edited by dandandamdandan1111; 03-2-2008 at 02:35 AM..

03-2-2008, 02:53 AM	#3
dore caveman pornstar Join Date: Feb 2006 Location: ridin on a unicorn Age: 33 Posts: 6,317	Re: High school Jr. Algebra Quadratic Equations dunno where you got that negative in step 3 0=3-sqrt(x-3) -3=-sqrt(x-3) 9=x-3 12=x __________________ http://www.youtube.com/watch?v=IREnpHco9mw

03-2-2008, 02:56 AM	#4
foilman8805 smoke wheat hail satin Join Date: Sep 2006 Location: LA baby Age: 35 Posts: 5,704	Re: High school Jr. Algebra Quadratic Equations Hahaha, I was looking at dan's work and I was like...oooh! There's an i! How excit - oh. He did it wrong. DJ_Okami, just to clarify, dore's post is the correct answer.

03-2-2008, 12:30 PM	#6
Relambrien FFR Player Join Date: Dec 2006 Location: Pittsburgh, PA Age: 32 Posts: 1,644	Re: [High School - Algebra] Quadratic Equations Here's a bit of a more in-depth explanation 0 = 3 - root(x-3) ------------ Given in problem -3 = -root(x-3) ------------ Subtract three from each side 9 = x-3 --------------------- Square each side (the -root is irrelevant in terms of squaring, as it just denotes the negative square root rather than the positive, and ends up squaring to the same thing) 12 = x ---------------------- Add three to both sides.

03-2-2008, 12:32 PM	#7
dandandamdandan1111 the baker man Join Date: Jun 2007 Location: merryland Age: 30 Posts: 2,176	Re: [High School - Algebra] Quadratic Equations Lol. I had 12 as my first answer, then I did it and got -6 for some reason. If I had done it on paper, I probably would've gotten it.

03-2-2008, 01:13 PM	#8
DJ_Okami FFR Player Join Date: Feb 2007 Location: in the corner of my round room Age: 34 Posts: 2	Re: [High School - Algebra] Quadratic Equations thanks guys, i suck at math...

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