- #1
unique_pavadrin
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Homework Statement
Hey I need to rearrange the following, and find x in terms of G, M, m, r
[tex]\frac{{GM}}{{x^2 }} = \frac{{Gm}}{{\left( {r - x} \right)^2 }}[/tex]
2. The attempt at a solution
I haven't manged to get far with this problem as I am confused about the powers of x and how to manage them. This is where I have manged to get to:
[tex]
\begin{array}{c}
\frac{{GM}}{{x^2 }} = \frac{{Gm}}{{\left( {r - x} \right)^2 }} \\
x^2 \left( {r - x} \right)^2 = GM\left( {Gm} \right) \\
x^2 \left( {r^2 - 2rx + x^2 } \right) = G^2 Mm \\
r^2 x^2 - 2rx^3 + x^4 = G^2 Mm \\
\end{array}
[/tex]
Any help is greatly appreciated, many thanks in advance,
unique_pavadrin