what is x in "x + (x * .11416) = 442.42" **Resolved**

what is x in "x + (x * .11416) = 442.42"
thanks
Michael

k the answer is 397.09 but I only got to that by trial and error... what is the formula to get this?
TIA
Michael

Subtract an x from each side

so .11416x = 442.42-x

add x to each side

1.11416x=442.42

x=442.42/1.11416

The answer is technically:

397.08838945932361599770230487542

Thanks!
Michael

Quote:

---

Originally posted by DiGiTaIErRoR
The answer is technically:

397.08838945932361599770230487542

---

this is money so we are rounding to the next cent. :)

does
(x * .11416)
mean the same exact thing as
.11416x
?

thanks again
Michael

Yes.

cool thanks again.
Math is what is keeping me from persuing my BS.

Ok so why did you subtract x then add x to both sides digitalerror? Was there a point to that?

I was only halfassed thinking.

Code:

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simpler approach
x + ( x * .11416) = 442.42
Add the "x" side together
1.11416 * x = 442.42
x = 442.42/1.11416
x= 397.09  (rounded)

---

397.09 is THE correct result because you cannot have more digits of precision answer than exist in the least precise number -- 5 digits - in the input values.

:D

Quote:

---

Originally posted by jim mcnamara

Code:

---

simpler approach
x + ( x * .11416) = 442.42
Add the "x" side together
1.11416 * x = 442.42
x = 442.42/1.11416
x= 397.09  (rounded)

---

397.09 is THE correct result because you cannot have more digits of precision answer than exist in the least precise number -- 5 digits - in the input values.

:D

---

in math you assume the given numbers in the question are exact.

of course if he came up with 0.11416 and/or 442.42 then yeah...

-C

Trial and error for a question like this??? How long did that take you?! :eek:

maybe 10 min's.

Wow, I would have guessed about an hour. If you can try 397.09 within ten minutes, you must be a psychic...

lol...
if you look at the times of the first two posts it is 15 mins apart. I guess I'm an idot savant (no wonder I passed all my math and still suck at it).
:)

Siyan -

FWIW - you should consider significant digits or accuracy in computational mathematics - what that his algebra problem was.

Please, See this site

http://mathworld.wolfram.com/SignificantDigits.html