Question

$x2 - 2x - 3 = 0$
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Answer 1

Resposta:

$\text{Leia abaixo}$

Explicação passo-a-passo:

$x^2 - 2x - 3 = 0$

$x = \dfrac{-b \pm \sqrt{\Delta}}{2a}$

$\Delta = b^2 - 4.a.c$

$\Delta = (-2)^2 - 4.1.(-3)$

$\Delta = 4 + 12$

$\Delta = 16$

$x' = \dfrac{2 + \sqrt{16}}{2.1} = \dfrac{2 + 4}{2} = \dfrac{6}{2} = 3$

$x'' = \dfrac{2 - \sqrt{16}}{2.1} = \dfrac{2 - 4}{2} = \dfrac{-2}{2} = -1$

$\boxed{\boxed{\text{S} = \left\{\:3, -1\:\right \}}}}$

Answer 2

Resposta:

tbm qieroooo a respostaaaa