SOLUTION: Simplify. Do not use negative exponents in the answer 5^-8-5^10

Question 320718: Simplify. Do not use negative exponents in the answer
5^-8-5^10
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
5^-8-5^10
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= 5^10-[1/(5^8)]
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lcd = 5^8
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Rewrite each fraction with the lcd as its denominator:
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= [(5*8*5^10)/5*8] - [1/(5^8)]
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= [5^18/lcd] - [1/lcd]
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= [5^18 - 1]/5^8
===================
where does the 1/5 fit into this problem how did you get that ad u changed 5^8lcd to 5^18 over -1 how did you do that i was trying to work that out
Cheers,
Stan H.
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