this is confusing me,

my teacher wrote an answer as

4.5 x 10^17

my calculator shows it as 4.5^17

how is that the same thing?

question is find energy "e"

info is given and you get

e=5(3 x 10^8)^2

could someone please explain the difference of

4.5 x 10^17

and

4.5^17

and why when I type 10^17 into my calculator and press = does it show 1^17 ?

Thanks.