Find values in a geometric sequence $-2, x, y, 1024 $ 
find the value of $x$ and $y$
what i got so far is that
$x/-2 = y/x = 1024/y $ 
and thats for finding the common ratio, cross multiply and isolating x and y gave me
$x^2 = -2y$
$y^2 = 1024x$
then I got nowhere after this

Multiply all the terms in these two equalities we get
$$\left(-\frac{x}{2}\right)^3=-\frac{x^3}8=-512$$
so $x=16$. Can you take it from here?
