Question

ESCREVA AS EQUAÇÕES ABAIXO NA FORMA GERAL E RESOLVA EM IR
X AO QUADRADO+2X-8=0

Answer 1

$x^{2} +2x-8=0\\\\ a=1;b=2;c=-8\\\\\\ \Delta=b^2-4ac\to \Delta=2^2-4*1*(-8)\to \Delta=4+32\to \Delta=36\\\\ x' \neq x''\\\\ x= \frac{-b\pm \sqrt{\Delta} }{2a} \to x= \frac{-2\pm \sqrt{36} }{2*1} \to x= \frac{-2\pm 6 }{2} \to \\\\\\ x'= \frac{-2+ 6 }{2} \to x'= \frac{4 }{2} \to x'=2\\\\\\ x''= \frac{-2- 6 }{2} \to x''= \frac{-8 }{2} \to x''=-4\\\\\\\\ S=(-4;2)$


Espero ter ajudado