SOLUTION: For what value is z is {{{5^8*5^z=1}}} Please help me I just know that is has to do with Negative and Zero powers because that is our leason we are on.

Question 948373: For what value is z is
Please help me I just know that is has to do with Negative and Zero powers because that is our leason we are on.
Answer by Edwin McCravy(20060) (Show Source): You can put this solution on YOUR website!
Any number (except 0 itself) raised to the zero power is 1.
Method 1: Using 0 exponent:
----------------------

Add the expontents of 5 on the left

Replace 1 on the right by

Since the bases are the same non-1 positive number 5 on
both sides we may just equate the exponents:

-----------------------------------
Method 2: Using negative exponent:

Divide both sides by

Move the from the bottom to the top
and change the sign of the exponent as

Equate the exponents

-------------------
Both ways are correct and give the same answer. Take your pick.
Edwin

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