Answered

which of the following are square roots of the number below ? check all that apply

81

A18

b.-(81)^1/2

c.9

d.81^1/2

Verified Answer :

JcAlmighty

The answers are:
b.-(81)^1/2
c.9 
d.81^1/2

√a = -a^1/2      ⇒ √81 = -81^1/2
√a = a^1/2       ⇒ √81 = 81^1/2

√81 = √9²
√a² = a            ⇒ √9² = 9
√a² = -a           ⇒ √9² = -9

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