Answer:
[tex]-\frac{1}{y^{4}}[/tex]
Step-by-step explanation:
we have
[tex]-y^{-4}[/tex]
Remember that
[tex]y^{-b} =\frac{1}{y^{b}}[/tex]
so
[tex]-y^{-4}=-\frac{1}{y^{4}}[/tex]
