Math Is Fun Forum
You are not logged in.
- Topics: Active | Unanswered
#1 2005-03-21 22:49:12
- I.M Stuck
- Guest
Algebra
what is x when:
3(x+456)+5(56x-45)=0
#2 2005-03-21 23:43:57
- MathsIsFun
- Administrator
- Registered: 2005-01-21
- Posts: 7,713
Re: Algebra
Was this set by a teacher, or are you just curious?
3(x+456)+5(56x-45)=0
Multiply out: 3x+3 * 456 + 5 * 56x + 5 *(-45)=0 (i am using * to mean multiply, so it doesn't look like x)
Simplify: 3x + 1368 + 280x -225 = 0
Simplify More: 283x + 1143 = 0
Rearrange (subtract 1143 from both sides): 283x = -1143
Rearrange (divide both sides by 283): x = -1143/283
So, x = -1143/283 = -4.04
"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman
Offline
#3 2005-03-22 08:18:13
- Roraborealis
- Member
- Registered: 2005-03-17
- Posts: 1,594
Re: Algebra
HAHAHAHAHAHAAHA! I.M. Stuck! That's funny!
School is practice for the future. Practice makes perfect. But - nobody's perfect, so why practice?
Offline
#4 2005-04-12 03:48:45
- Mr T
- Member
- Registered: 2005-03-30
- Posts: 1,012
Re: Algebra
i pity the foo' who messes wiv mi homie
I come back stronger than a powered-up Pac-Man 
I bought a large popcorn @ the cinema the other day, it was pretty big...some might even say it was "large
Fatboy Slim is a Legend
Offline
#5 2005-04-13 08:45:50
- mohit
- Member
- Registered: 2005-04-13
- Posts: 7
Re: Algebra
what is x when:
3(x+456)+5(56x-45)=0
3x+1368+280x-225=0
283x+1143=0
283x=-1143
x=-1143/283
therefore x= -4.04
Offline