SOLUTION: Solve each equation. Show all your work for full credit
a. 3^2n+1 = 81
b. log10 4 + log10 (z+3)=2
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Question 1028824: Solve each equation. Show all your work for full credit
a. 3^2n+1 = 81
b. log10 4 + log10 (z+3)=2
Found 3 solutions by stanbon, Fombitz, josmiceli:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
a. 3^2n+1 = 81
3^(2n+1) = 3^4
2n+1 = 4
n = 3/2
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b. log10 4 + log10 (z+3)=2
log(4z+12) = 2
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4z+12 = 10^2
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4z = 88
z = 22
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Cheers,
Stan H.
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Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
.
.
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Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
(a)
--------------
check:
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(b)
( whenever the base is not specified,
it is assumed to be 10 )
Now the trick is to express as a log
----------------
check:
OK
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