Question

por favor me ajude nessa equaçao do 2 grau -x²+6x-5

Answer 1

$- x^{2} +6x-5=0\\\\ a=-1;b=6;c=-5\\\\\\ \Delta=b^2-4ac\to \Delta=6^2-4*(-1)*(-5)\to \Delta=36-20\to \Delta=16\\\\\\ x' \neq x''\\\\\\ x= \frac{-b\pm \sqrt{\Delta} }{2a} \to x= \frac{-6\pm \sqrt{16} }{2*(-1)} \to x= \frac{-8\pm 4 }{-2} \to \\\\\\ x'= \frac{-8\+4 }{-2} \to x'= \frac{-4 }{-2} \to x'=2\\\\\\ x''= \frac{-8- 4 }{-2} \to x''= \frac{-12 }{-2} \to x''=6\\\\\\\\ S=(2;6)$