These rules for exponents
give some insight into why
logarithms are useful for performing multiplication, division, and
exponent operations.
The exponent is usually shown as a superscript to the right of the base. The
exponentiation a
^{n} can be read as: a raised to the nth power, a raised to the power [of] n or possibly
a raised to the exponent [of] n, or more briefly: a to the nth power or a to the power [of] n, or even more
briefly: a to the n. Some exponents have their own pronunciation: for example, a
^{2} is usually read as a
squared and a
^{3} as a cubed.
The power an can be defined also when n is a negative integer, at
least for nonzero a. No natural extension to all real a and n exists, but when the base a is a positive real
number, an can be defined for all real and even complex exponents n via the exponential function e
^{z}.
Trigonometric functions can be expressed in terms of complex exponentiation.
 Wikipedia
a^{x} · a^{y} = a ^{(x+y)} 


( a · b )^{x} = a^{x}
· b^{x} 
( a^{x} )^{y} = a ^{x·y} 





