[tex]x^2+6x-7\\\\S=-6\\\\P=-7\\\\x'=1\\\\x''=-7[/tex]
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[tex]\lim_{x \to 2} \frac{x^2+6x-7}{x-1}\\\\ \lim_{x \to 2} \frac{(x-1)(x+7)}{x-1}\\\\\lim_{x \to 2} x+7 =9[/tex]
