Posted by Chris on Monday, April 4, 2011 at 9:14pm.
4z3(3z1)+7(3z1)

Math  emily, Monday, April 4, 2011 at 9:19pm
what is the goal? to simplify? if so it would be:
12z^44z^3+21z7
z^2 means z squared, z^3 z cubed, etc.
i assumed that the 4z3 at the beginning was four z cubed... 
Math  Bosnian, Tuesday, April 5, 2011 at 10:06am
4z^3*(3z1)+7(3z1)=
4z^3*(3z1)+(7*3)*z+7*(1)=
4z^3*3z+4z^3*(1)+21z7=
12z^44z^3+21z7
By the way in google type:
Expessions Simplifier
When you see list of results click on:
Expessions Simplifier and SolverAlgebra com
When page be open in rectacangle type your equation 4z3(3z1)+7(3z1)
and click option SOLVE OR SIMPLIFY
You will se solution stepbystep
On that site you can simplify any kind of equation.