Question 282693
Here's a start...
{{{2t^3z^4 - 2t^3 = 2t^3(z^4-1)}}}
{{{2t^3(z^4-1) = 2t^3(z^2+1)(z^2-1)}}}
{{{2t^3(z^2+1)(z^2-1) = 2t^3(z^2+1)(z-1)(z+1)}}}