.50 - x / x = 3.20e-1

I need to solve for x. I was going to do .50 X 3.20e-1 and then take the square root but this is not correct. I am not sure what to do. Thank you for your help.

Math(Please help) - Reiny, Tuesday, April 17, 2012 at 3:18pm
You probably meant

(.50 - x)/x = 3.2 e^-1= 3.2/e
crossmultiply ...
.50 - x = (3.2/e)x
(3.2/e)x + x = .5
x(3.2/e + 1)
x = .5/(3.2/e + 1)
multiply by e/e
= .5e/(3.2 + e)
multiply by 10/10
= 5e/(32 + 10e)

So I have to multiply 5e by 10 which would be 50e and then multiply (32+10e) by 10?

Math(Please respond) - bobpursley, Wednesday, April 18, 2012 at 7:17pm
Hannah: Professor Reiny solved it for you.

x= 10e/(32+10e)

calculate that. Or if you cant, put this in your google search window

10*e/(32+10*e) =

I understand. If the number was 2.49e-1 I would do the same thing, so it would be 10*e / (249 + 10*e) = ?. Is this correct?

I started to write this a couple of days ago when I saw this post but didn't. Frankly, I thought both professor Reiny and professor Pursley misinterpreted the question. I still think so. I don't think it has anything to do with e. I believe you meant

[(0.50-x)/x] = 3.20E-1 which I would rewrite as
0.320 = (0.50-x)/x, then
0.320x = 0.50-x
1.320x = 0.50 and
x = 0.50/1.320
x = ?

Ok thank you the way you have it is exactly the way that it was stated on my homework. The only problem is that I realized that I had the typed the wrong number. It was suppose to be the same equation but with 2.49e-1 instead 3.20e-1. I understand everything except how did you get 1.320?

0.320 = (0.50-x)/x, then

0.320x = 0.50-x
0.320x = 0.50 -x
add x to both sides.
0.320x + x = 0.50 -x +x
0.320x + 1x = 0.50
1.320x = 0.50 and
x = 0.50/1.320.

1.320x = 0.50 and
x = 0.50/1.320

Thank you.

Yes, that is correct. To solve for x in the equation (.50 - x)/x = 3.2e-1 (or 3.2/e), you can follow the steps provided by Math(Please help) and Math(Please respond).

Based on the equation from Math(Please help), we have x = 5e/(32 + 10e).
To calculate the value of x, you can substitute the value of e into the equation. In this case, e is a number, so you can simply plug it in.

For example, if the number e is 2.49e-1, then you can substitute it into the equation:
x = 10*e/(32 + 10*e)
x = 10*(2.49e-1)/(32 + 10*(2.49e-1))

To find the value of x, you can either manually calculate this expression or use a tool like a calculator or the Google search window mentioned by Math(Please respond). Simply enter the expression 10*e/(32+10*e) into the Google search window and it will give you the numerical value of x.

Remember to apply the correct order of operations (multiplication before addition) when evaluating the expression.