[tex] - 4c + 9c - c + 8. \: \: c = - 8 \\ - 4 \times ( - 8) + 9 \times ( - 8) - ( - 8) + 8 \\ 32 - 72 + 64 = 24[/tex]
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[tex] - 4c + 9c - c + 8. \: \: c = - 8 \\ - 4 \times ( - 8) + 9 \times ( - 8) - ( - 8) + 8 \\ 32 - 72 + 64 = 24[/tex]