The above items might help you with these questions!
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An exponent is a small superscript number that tells you how many times a number is multiplied by itself. For example, if you have the number 4 and you want to multiply it by itself five times you could write it out as follows:
4 x 4 x 4 x 4 x 4 =
100 x 100 = 10000
50 x 50 = 2500
10000 - 2500 = 7500 + 17 = 7517
1002 - 502 + 17 = 7517