Ok, I am stuck on this hyperboloid equation.

Find the equation of the hyperboloid of one sheet passing through the points and .

I know the general equation for the single sheet hyperboloid which is :

$\displaystyle (x/a)^2+(y/b)^2=(z/c)^2+1$

I have found (a) and (b) in the above equation, but how do I find (c)?

Thanks!!