Question

4) Vamos resolver a equação x2 – 1 = 8,61.
a) as raízes são x1 = 3,2 e x2 = 3,2.
b) as raízes são x1 = 3,1 e x2 = 3,1.
c) as raízes são x1 = 3,4 e x2 = 3,4.
d) as raízes são x1 = 4,1 e x2 = 4,1.

Answer 1

Resposta:

R: Alternativa B.

Explicação passo a passo:

$x^2-1=8,61\\\\x^2=8,61+1\\\\x^2=9,61\\\\x=\pm\sqrt{9,61}\\\\x=\pm3,1\\\\x=3,1\ e\ x=-3,1$