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PLEASEEE HELP THANK YOU!!

PLEASEEE HELP THANK YOU!!-example-1
User Aniket Jha
by
8.8k points

1 Answer

7 votes

Answer:

6i
√(21)

Explanation:

Note that
√(-1) = i

Using the rule of radicals


√(a) ×
√(b)
√(ab)

Simplifying the radical, that is


√(-84)

=
√(4(21)(-1))

=
√(4) ×
√(21) ×
√(-1)

= 2 ×
√(21) × i

= 2i
√(21)

Hence

3
√(-84)

= 3 × 2i
√(21)

= 6i
√(21)

User Hema
by
8.1k points

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