Question

me ajudem por favor!

Answer 1

-$x^2+2x-35=0\\\Delta =4-4.1.(-35)\Rightarrow \Delta =144\\x=\frac{-2\pm \sqrt{144}}{2}\Rightarrow x=\frac{-2\pm 12}{2}\\\\\Rightarrow x_1=-7\\\Rightarrow x_2=5$