square (3y^3)(-2y^2)= square (-12v^5)/(3v^5)= square (-4z^3)^2= square (-64y^6)/(-8y^2)= square

$(3y^{3})(-2y^{2}) = -6y^{5}$<br /><br />$\frac {-12v^{5}}{3v^{5}} = -4$<br /><br />$(-4z^{3})^{2} = 16z^{6}$<br /><br />$\frac {-64y^{6}}{-8y^{2}} = 8y^{4}$