The principal 4th root of (-3)^4 is:

Question

-3

either -3 or 3

3

9

not a real number

Answer 1

the principal root is the positive root

(-3)^4=81

⁴√81=3, not -3

 

ⁿ√(-3)ⁿ=l-3l=+3 when n is even