SOLUTION: I have been working on this math problem and I can't figure out how to get the answer. I was wondering if someone could help me? Please and Thank You!! I would deeply appreciate it

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Question 175942This question is from textbook Algebra and Trigonometry Structure and Method book 2
: I have been working on this math problem and I can't figure out how to get the answer. I was wondering if someone could help me? Please and Thank You!! I would deeply appreciate it!!
Simplify each expression. If the expression does not represent a real number say so.
a. square root of -a^2
b. square root of (-a)^2
c. index=4 square root of a^4
d. square root of a^6
This question is from textbook Algebra and Trigonometry Structure and Method book 2

Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
a. square root of -a^2
-sqrt%28a%5E2%29
-a
.
b. square root of (-a)^2
sqrt%28-a%5E2%29
ai
.
c. index=4 square root of a^4
I'm assuming you want the "fourth root" of a^4
Because a^4 = a*a*a*a
then the fourth root of a^4= a
.
d. square root of a^6
sqrt%28a%5E6%29
sqrt%28a%5E3%2Aa%5E3%29
a%5E3