Respuesta :

Answer:

a. -200

Step-by-step explanation:

Square root both sides:

x = +/- 200

x = -200, 200

x = -200

Answer:

b

Step-by-step explanation:

Given

x² = 400 ( take the square root of both sides )

x = ± [tex]\sqrt{400}[/tex] = ± 20

Thus x = - 20 is a solution of the equation → b

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