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5 votes
Plz help me with this

Plz help me with this-example-1

2 Answers

6 votes

Answer:

i

Explanation:

note that
√(-1) = i

Given


√(-25) -
√(-16)

=
√(25(-1)) -
√(16(-1))

=
√(25) ×
√(-1) - (
√(16) ×
√(-1))

= 5i - 4i

= i

User StackMonk
by
8.1k points
3 votes

Answer: c) i

Explanation:


√(-25)-√(-16)\\\\=√(-1\cdot 5\cdot 5)-√(-1\cdot 4\cdot 4)\\\\=5i-4i\qquad \qquad \qquad \qquad \text{Note: }√(-1)=i\\\\=i

User Sebix
by
8.8k points

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