Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °
You are not logged in.
#2 2005-03-22 22:43:57
- MathsIsFun
- Administrator
Offline
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
#3 2005-03-23 07:18:13
- Roraborealis
- Super Member
Offline
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?
Fatboy Slim is a Legend