-119
1) Let's evaluate that polynomial when y=4, note that to evaluate is to find out the corresponding value when we plug into that another one:
[tex]\begin{gathered} -5y^2-8y-7,y=4 \\ -5(4)^2-8(4)-7 \\ -5(16)-32-7 \\ -119 \end{gathered}[/tex]
2) Hence, the answer is -119
