Write the following as complex numbers: ...

Write the following as complex numbers:
(i) `sqrt(-16)`
(ii) `-1-sqrt(-5)`
(iii) `-b+sqrt(-4ac),(a,c gt0)`

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The correct Answer is:

(i) `0+4i`
(ii) `-1-sqrt(5)i`
(iii) `-b+isqrt(4ac)`.

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