### Home > INT3 > Chapter 8 > Lesson 8.3.4 > Problem 8-144

8-144.

Shinna wants to factor 9

*x*^{2}*y*^{4}–*z*^{6}.*“Wait!”*she says.*“I think I can see a way to use the difference of squares factoring pattern!”*Homework Help ✎Is Shinna’s expression a difference of squares? If so, what are the “squares”? If not, explain why.

Help Shinna factor the expression 9

*x*^{2}*y*^{4}–*z*^{6}.

Yes; it is the difference of the square (3*xy*^{2})^{2} and the square (*z*^{3})^{2}.

Remember that one factor contains addition and the other subtraction.