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Need Help With an Equation


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10 replies to this topic

#1 of 11 OFFLINE   WillG

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Posted June 17 2007 - 11:41 AM

This may seem like simple stuff for some of you geniuses here (sincerely) but I have not done this in years. My wife is studying for a financial test with math she has not done in years. And this has got me somewhat stumped as well.

Can someone show me how to solve for x in the following equation

362.81=350.45+350.45(.0525)-350.45x

x=1.7231

Thanks in advance
STOP HIM! He's supposed to die!

#2 of 11 OFFLINE   SethH

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Posted June 17 2007 - 12:04 PM

1. Mulitiply 350.45*0.0525 (=18.398625)
2. Add the result above to 350.45 (=368.848625)
3. Move result to left side of equation by subtracting it over (=-6.038625)
4. Divide result above by -350.45

X = 0.017231 . . .

#3 of 11 OFFLINE   Keith Mickunas

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Posted June 17 2007 - 12:04 PM

This is an odd looking formula, but it's not hard to solve at all. First subtract the two numbers on the right that don't have X from both sides. Then merely divide by -350.45.

#4 of 11 OFFLINE   WillG

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Posted June 17 2007 - 12:52 PM

Quote:
but it's not hard to solve at all

Oh, so I guess that makes me dumb Posted Image

Just kidding

I figured out what I was doing wrong. I was trying to solve it in Excel. And I typed in, literally (.0525) which Excel treated as a negative number I've had a few beers

Thanks. I can use the refresher
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#5 of 11 OFFLINE   BrianW

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Posted June 17 2007 - 01:03 PM

Another way to look at it is to associate everything on the right side of the equation, which is made possible by every term on the right side having the explicit factor of 350.45 (presumably the beginning balance of an interest-bearing account, or something like that):


362.81 = 350.45 + 350.45(.0525) - 350.45x

362.81 = 350.45(1 + .0525 - x)

362.81 / 350.45 = 1.0525 - x

x = 1.0525 - (362.81 / 350.45)

x = 0.017231


It yields exactly the same answer (and is algebraically equivalent to) the responses above, but I find that thinking of it in this way is helpful because it associates the beginning balance factor (1) with the interest earned (.0525) and the interest deducted (x) together to give you a single number (1 + .0525 + x) to multiply by the beginning balance (350.45) to arrive at the ending balance (362.81). This gives me a simple formula that relates beginning balance with ending balance, which is much easier for me to wrap my brain around.

[Edit: Sorry, Will, you slipped your last one in before I could finish my response. Had I known that beer was involved, I would have tailored my answer accordingly. Posted Image]
-Brian
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#6 of 11 OFFLINE   Joseph DeMartino

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Posted June 17 2007 - 02:09 PM

:beer:

#7 of 11 OFFLINE   Keith Mickunas

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Posted June 17 2007 - 02:09 PM

Quote:
Originally Posted by WillG
Oh, so I guess that makes me dumb Posted Image

Just kidding

I figured out what I was doing wrong. I was trying to solve it in Excel. And I typed in, literally (.0525) which Excel treated as a negative number I've had a few beers

Thanks. I can use the refresher
I knew Excel could be set to display numbers in parenthesis when they are negative, but I didn't think it'd interpret them that way, that's not intuitive at all to me, but then I was a math major, I don't do business math much.

#8 of 11 OFFLINE   Joseph DeMartino

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Posted June 17 2007 - 02:11 PM

Wait a minnit - this is the HTF and we don't have a beer smiley, like the one seen here?

Regards,

Joe

#9 of 11 OFFLINE   BrianW

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Posted June 17 2007 - 11:23 PM

:lager:

:ale:

:malt liquor:

:lite beer:

:near beer:

:beerbeerBEER:



Sorry, Joe. Can't help you.
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#10 of 11 OFFLINE   andrew markworthy

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Posted June 18 2007 - 08:25 AM

:vintage claret:

That doesn't work either.

#11 of 11 OFFLINE   BrianW

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Posted June 18 2007 - 10:08 AM

Quote:
Originally Posted by andrew markworthy
:vintage claret:
Ooooh! Now we're getting fancy!



Posted Image
-Brian
Come, Rubidia. Let's blow this epoch.





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