exponents is the number of times you will multiply the number to itself
ex. 2^3
3 is the exponent meaning 2^3 = 2 x 2 x 2
you will multiply 2 by itself 3 times
radicals imaginary numbers occurs when a negative integer is inside a rooted value
ex. [tex] \sqrt{-2} [/tex]
its just the same as [tex] \sqrt{2 * -1} [/tex] where [tex] \sqrt{-1} [/tex] is i and i represents imaginary