solving equation

**iphysics** · May 4th 2008, 09:20 PM

$751 =\pi \* 75^2 [-1/(x+30) + 1/x]$

Find the value of x.

I already tried expanding, but it just makes things worse.

According to my calculator, x should be about 15.5, but I got no way to prove it!

**o_O** · May 4th 2008, 09:25 PM

$751 = 75^{2}\pi \left(\frac{1}{x} - \frac{1}{x+30}\right)$

Is this your equation?

$\frac{751}{75^{2}\pi} = \frac{1}{x} - \frac{1}{x+30}$

$\frac{751}{5625\pi} = \frac{x+30 - x}{x(x+30)}$

$\frac{751}{5625\pi} = \frac{30}{x^{2} + 30x}$

Cross multiply and keep going

**topsquark** · May 5th 2008, 03:25 AM

Originally Posted by iphysics

$751 =\pi \* 75^2 [-1/(x+30) + 1/x]$

Find the value of x.

I already tried expanding, but it just makes things worse.

According to my calculator, x should be about 15.5, but I got no way to prove it!

You would do better to post your whole problem, rather than post it in pieces. It would make it easier to help you and provide more continuity for you (and others) trying to put the pieces together.

-Dan

Thread: solving equation

LinkBack

Thread Tools

Display

solving equation

Similar Math Help Forum Discussions

HELP on solving this equation for Q

Solving an equation

Need help solving this equation

solving diff equation w/ bournoulli's equation

solving an equation

Search Tags