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Bunuel
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If x = -2, then what's inside the fourth-root sign is 16. Why exactly can't the fourth root of 16 be -2?
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Thank you for the explanation. However, I am still puzzled.

If x^2 = 9, then x = √9. So why does the first equation have two solutions, while the second equation only one?
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hessen923
Thank you for the explanation. However, I am still puzzled.

If x^2 = 9, then x = √9. So why does the first equation have two solutions, while the second equation only one?

Because \(x^2 = 9\) means that \(x =-\sqrt{9}=-3\) or \(x=\sqrt{9}=3\).
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Duplicate of D01-13. Unpublished..................................
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