Question

Plz help me with this

Answer 1

i

Explanation:

note that
`√(-1)` = i

Given

`√(-25)` -
`√(-16)`

=
`√(25(-1))` -
`√(16(-1))`

=
`√(25)` ×
`√(-1)` - (
`√(16)` ×
`√(-1)`)

= 5i - 4i

= i

Answer 2

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`