Question

equançao de segundo grau 7x2 + 3x -4 = 0​

Answer 1

Resposta:

da 68 tudo hihi TwT

Explicação passo-a-passo:

Answer 2

Resposta:

S={-1, 4/7}

Explicação passo-a-passo:

$\displaystyle Aplicando~a~f\'{o}rmula~de~Bhaskara~para~7x^{2}+3x-4=0~~\\e~comparando~com~(a)x^{2}+(b)x+(c)=0,~temos~a=7{;}~b=3~e~c=-4\\\\\Delta=(b)^{2}-4(a)(c)=(3)^{2}-4(7)(-4)=9-(-112)=121\\\\x^{'}=\frac{-(b)-\sqrt{\Delta}}{2(a)}=\frac{-(3)-\sqrt{121}}{2(7)}=\frac{-3-11}{14}=\frac{-14}{14}=-1\\\\x^{''}=\frac{-(b)+\sqrt{\Delta}}{2(a)}=\frac{-(3)+\sqrt{121}}{2(7)}=\frac{-3+11}{14}=\frac{8\div2}{14\div2}=\frac{4}{7}\\\\\\S=\{-1,~\frac{4}{7}\}$