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Beccabonita · Oct 7, 2010, 07:30 PM

Unknown008 · Oct 8, 2010, 12:21 AM

Do you mean:

$\frac{z}{y+r} = rw$

And you need to make which variable the subject of formula? r?

Beccabonita · Nov 3, 2010, 07:08 PM

Yes but I do not understand on how to solve the problem

Unknown008 · Nov 3, 2010, 10:38 PM

It's simple as soon as you understand what you have to do.

Since you have 2 r's on different sides of the equal sign, one being in a fraction, you 'cross-multiply' to get this:

$z = rw(y+r)$

Now you expand:

$z = rwy + r^2w$

Now, this is getting a little difficult if you don't know the quadratic formula... (or completing the square) which goes when you have this:

$r^2w + rwy - z = 0$

Can you tell use which of the two (quadratic formula or completing the square) you know how to use?

Beccabonita · Nov 4, 2010, 02:07 PM

Ohh I need a class of math & chemistry lol

Beccabonita · Nov 4, 2010, 02:07 PM

Thanks

Unknown008 · Nov 5, 2010, 12:16 AM

Uh... no problem. I assume that you solved it now?