We want to expand the equation;
[tex](9x^3-6x)(-2x^2+4)[/tex]We need to multiply each of the terms in the first bracket by each term in the second bracket.
[tex]\begin{gathered} (9x^3-6x)(-2x^2+4) \\ 9x^3(-2x)+9x^3(+4)-6x(-2x^2)-6x(+4) \\ -18x^4+36x^3+12x^3-24x \\ -18x^4+48x^3-24x \end{gathered}[/tex]Therefore, expanding the given equation gives;
[tex]-18x^4+48x^3-24x[/tex]