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Exponents
Properties: a) a0= 1, a≠0
b) a-n= 1/an
c) aman=am+n
d) am/an= am/n
e) ( am)n= amn
f) (ab)m= ambm
g) (a/b)m= am/bm
h) (a+b)n≠ an+bn
square roots: let a≥0
the positive number that satisfies x2=a. -
Square-roots of negative numbers do not exist as real numbers therefore
Thus expressions under the root symbol must be ≥0
Example:
X=2,8