Question

$2 {x}^{2} - 1 = 0$
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Answer 1

Resposta:

$2x^2-1=0\\ \\ 2x^2=1\\ \\ x^2={1\over2}\\ \\ x=\pm\sqrt{{1\over2}} \\ \\ x=\pm{1\over\sqrt{2} }\\ \\ racionalizar\\ \\ x=\pm{\sqrt{2} \over\sqrt{2} .\sqrt{2} }\\ \\ x=\pm{\sqrt{2} \over\sqrt{4} }\\ \\ x=\pm{\sqrt{2} \over2}$

Answer 2

Resposta:

S = {√1/2; - √1/2}

Explicação passo-a-passo:

2x² - 1 = 0

2x² = 1

x² = 1/2

x = ± √1/2

x' = √1/2

x" = - √1/2

S = {√1/2; - √1/2}

Bons estudos.