Question

Evaluate the following.
let me know if its "Not a real number"
-√81
√-16

Answer 1

Answer:

-9, Undefined

Step-by-step explanation:

-√81

-√9^2

-9

Answer 2

Answer:

Step-by-step explanation:

(1)

-√81 = -9 (although you could argue that it's ± 9, since 81 has two square roots:  9 and -9).  Real number.

(2) √(-16) is imaginary, and the value is i·4 (or -i·4).  Not a real number.