Query about Question 2 from "PrepSwift Quant Tickbox Quiz #1 (Arithmetic Column 1)" [6356]

[user9569]

https://prepswift.gregmat.com/quizzes/quiz/prepswift-quant-tickbox-quiz-1-arithmetic-column-1 (Question 2)

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Underroot of 36 can be -6 too making it lesser than 6. why ignore that possibility?

[Leaderboard]

@user9569

Underroot of 36 can be -6

\sqrt{36} = 6 only; review the videos again.