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Answer:
-3
Step-by-step explanation:
x= -1
y= 8
[tex]c \: = - 5 {x}^{2} - 10x - y \\ = - 5 {( - 1)}^{2} - 10( - 1) - 8 \\ = - 5 + 10 - 8 \\ = - 3[/tex]