Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

**I.M Stuck****Guest**

what is x when:

3(x+456)+5(56x-45)=0

**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,604

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

**Roraborealis****Member**- Registered: 2005-03-17
- Posts: 1,594

HAHAHAHAHAHAAHA! I.M. Stuck! That's funny!

School is practice for the future. Practice makes perfect. But - nobody's perfect, so why practice?

Offline

**Mr T****Member**- Registered: 2005-03-30
- Posts: 1,012

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

**mohit****Member**- Registered: 2005-04-13
- Posts: 7

I.M Stuck wrote:

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