Question

Express the square root of -80 in its simplest terms.

A- cannot be determined
B- 8i sqrt 10
C- 4i sqrt 5
D- 2i sqrt 20

Answer 1

C

Explanation:

noting that
`√(-1)` = i

Given

`√(-80)`

=
`√(16(-1)(5))`

=
`√(16)` ×
`√(-1)` ×
`√(5)`

= 4i
`√(5)` → C