Question

x²+9x+9=0 resolva pfvr me ajudem ​

Answer 1

$\mathrm{Para\:uma\:equacao\:de\:segundo\:grau\:da\:forma\:}ax^2+bx+c=0\mathrm{\:as\:solucoes\:sao\:}$

$x_{1,\:2}=\frac{-b\pm \sqrt{b^2-4ac}}{2a}$

$\mathrm{Para\:}\quad a=1,\:b=9,\:c=9$

$x_{1,\:2}=\frac{-9\pm \sqrt{9^2-4\cdot \:1\cdot \:9}}{2\cdot \:1}$

$resolvido\: delta$

$x_{1,\:2}=\frac{-9\pm \:3\sqrt{5}}{2\cdot \:1}$

$\mathrm{Separe\:as\:solucoes}$

$x_1=\frac{-9+3\sqrt{5}}{2\cdot \:1},\:x_2=\frac{-9-3\sqrt{5}}{2\cdot \:1}$

$As\:solucoes\:para\:a\:equacao\:de\:segundo\:grau\:sao:\:$

$x=\frac{-9+3\sqrt{5}}{2},\:x=\frac{-9-3\sqrt{5}}{2}$