how to plot this ?

x=5.3;z= 7.8

xz/(x/z)^2+14x^2-0.8z^2

Answer 1

[KSSV]

As you have a single values, you may plot only a single point.

x=5.3;
z= 7.8 ; 
iwant = x*z/(x/z)^2+14*x^2-0.8*z^2

iwant = 434.1261

But if you have a vector, you can plot:

x=linspace(2,5.3);
z= linspace(5,7.8) ;
[x,z] = meshgrid(x,z) ; 
iwant = x.*z./(x./z).^2+14*x.^2-0.8*z.^2 ;
surf(x,z,iwant)