Given the expression:
[tex](7xy^2)(y^2-4z)[/tex]Let's simplify the expression.
Apply distributive property:
[tex]y^2(7xy^2)-4z(7xy^2)[/tex]Solving further:
[tex]\begin{gathered} 7x(y^2y^2)-(4*7)xy^2z \\ \\ 7x(y^{2+2})-28xy^2z \\ \\ 7xy^4-28xy^2z \end{gathered}[/tex]Therefore, the simplified expression is:
[tex]7xy^4-28xy^2z[/tex]ANSWER:
[tex]7xy^4-28xy^2z[/tex]