What is the square root of 64?
3 Answers
It's 8 or -8.
Explanation:
8 x 8 = 64.
The principal square root of
#sqrt(64) = 8#
The other (non-principal) square root is:
#-sqrt(64) = -8#
Explanation:
#8^2 = (-8)^2 = 64#
When we say "the square root", what is usually intended is "the principal square root", which in the case of the Real square root of a positive number is the positive one.
Any non-zero number
Complex footnote
If
#+-i sqrt(-n)#
In this case we call
For example:
#sqrt(-64) = 8i# is the principal square root.
#-sqrt(-64) = -8i# is the other square root.
Note that