Question

5(x²-1)=0

Equação do 2 grau, como resolver?

Answer 1

Resposta:

$\sf \displaystyle 5 \cdot (x^{2} - 1) = 0$

$\sf \displaystyle (x^{2} - 1) = \dfrac{0}{5}$

$\sf \displaystyle (x^{2} - 1) = 0$

$\sf \displaystyle x^{2} - 1 = 0$

$\sf \displaystyle x^{2} = 1$

$\sf \displaystyle x^{2} = \pm \: \sqrt{1}$

$\sf \displaystyle x_1 = 1$

$\sf \displaystyle x_2 = -\; 1$

$\sf \boldsymbol{ \sf \displaystyle S = \{ x \in \mathbb{R} \mid x = -\: 1 \mbox{\sf \;e } x = 1 \} }$