Respuesta :

Answer: x = -2, 2

Step-by-step explanation:

2x^2 + 1 = 9

        -1.     -1

2x^2 = 8

2x^2/2 = 8/2

x^2 = 4

[tex]\sqrt{x^2} = \sqrt{4}[/tex]

x = -2, 2

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