[tex]y = {x}^{2} - 4 {x}^{2} - 8 = - {x}^{2} - 8 \\ y' = - 2 {x}^{2 - 1} = - 2x \\ x_{o} = 0.5 \\ y' = - 2 \times 0.5 = - 1[/tex]
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[tex]y = {x}^{2} - 4 {x}^{2} - 8 = - {x}^{2} - 8 \\ y' = - 2 {x}^{2 - 1} = - 2x \\ x_{o} = 0.5 \\ y' = - 2 \times 0.5 = - 1[/tex]