Question

quanto é x ao quadrado menos 3X + 2 = 0​

Answer 1

Resposta:

$Aplicando~a~f\'{o}rmula~de~Bhaskara~para~x^{2}-3x+2=0~~\\e~comparando~com~(a)x^{2}+(b)x+(c)=0,~temos~a=1{;}~b=-3~e~c=2\\\\\Delta=(b)^{2}-4(a)(c)=(-3)^{2}-4(1)(2)=9-(8)=1\\\\x^{'}=\frac{-(b)-\sqrt{\Delta}}{2(a)}=\frac{-(-3)-\sqrt{1}}{2(1)}=\frac{3-1}{2}=\frac{2}{2}=1\\\\x^{''}=\frac{-(b)+\sqrt{\Delta}}{2(a)}=\frac{-(-3)+\sqrt{1}}{2(1)}=\frac{3+1}{2}=\frac{4}{2}=2\\\\S=\{1,~2\}$