Break an equation into 2 lines

If an equation is too long to fit in one line, how to break it into two lines? An example of a long equation is as below and I wish to put it in two lines:

z=x(1)^2-2*x(1)*x(2)+6*x(1)+4*x(2)^2-3*x(2)+7*x(1)+5*x(2)^2-3*x(2)*x(1)^2-2*x(1)

Answer 1

[Azzi Abdelmalek]

 z=x(1)^2-2*x(1)*x(2)+6*x(1)+4*x(2)^2-3*x(2)...
   +7*x(1)+5*x(2)^2-3*x(2)*x(1)^2-2*x(1)

[Azzi Abdelmalek]

Thanks Matt, it's fixed

Answer 2

[Yowh]

z=x(1)^2-2*x(1)*x(2)+6*x(1)+4*x(2)
z=z^2-3*x(2)+7*x(1)+5*x(2)^2-3*x(2)*x(1)^2-2*x(1)

[Soumyaranjan]

Thanks Yowh

[Walter Roberson]

Would have to be

z=x(1)^2-2*x(1)*x(2)+6*x(1)+4*x(2)
z=z-3*x(2)+7*x(1)+5*x(2)^2-3*x(2)*x(1)^2-2*x(1)