malgal2010: z^-15(z^5x)^3/8yx^3
This is the question you have asked
[z^-15*(z^5*x)^3 /8 ] * yx^3
=z^-15 * z^15 * x^3 * x^3 * y / 8
= z^0 * x^6 * y / 8
= yx^6 / 8
Now, this is the question that I think you intended
[ z^-15(z^5x)^3 ] / [8yx^3]
=[z^-15 * z^15 * x^3] / [8yx^3] (The x^3 on the top and bottome cancel each other out)
= z^0 / (8y)
= 1/(8y)
When you can't display fractions properly, you have to be very careful to use brackets so that the meaning is properly displayed.
+118654 
