Question

Me ajudem

Qual o resultado ?

 

x² + 7x + 5 = 0

 

ps: Equacao d 2º grau

:s , eu me confundo tudo e nao consegui fazer me ajudem

Answer 1

Aplicando Delta !

D = B² - 4ac

a=1
b=7
c=5

D= 7² -4.1.5
D= 49 - 20
>>>D= 29<<<

Depos  X = -b +ou-  raiz de Delta /2a 

X =-7+raiz de 29/2      ou  X = -7 - raiz de 29/2

 

Answer 2

$<var>x^2 + 7x + 5 = 0 \\\\ \bullet a = 1 \\ \bullet b = 7 \\ \bullet c = 5 \\\\ x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \\\\ x = \frac{-7 \pm \sqrt{7^2 - 4 \cdot 1 \cdot 5}}{2} \\\\ x = \frac{-7 \pm \sqrt{29}}{2} \\\\ x' = \frac{-7 + \sqrt{29}}{2} \\\\ x'' = \frac{-7 - \sqrt{29}}{2}</var>$