Jawabanmu

2014-09-05T21:42:15+07:00
A. 3x=81
x=27
b.5x=125
x=25
c.32x=8
x=1/4
d.2x=1/8
x=1/16
e.16x=1/12
x=1/32
f.7x=1/49
x=1/343
Maaf jawabanku salah. Kukira itu bukan pangkat
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2014-09-05T21:43:55+07:00
3^{x} = 81

3^{x} = 3^{4}

x = 4
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5^{x} = 125

5^{x} = 5^{3}

x = 3
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32^{x} = 8

2^{x+5} = 2^{3}

x + 5 = 3
x = -2
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2^{x} =  \frac{1}{8}

2^{x} = 2^{-3}

x = -3
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16^{x} =  \frac{1}{2}

2^{x+4} = 2^{-1}

x + 4 = -1
x = -5
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7^{x} =  \frac{1}{49}

7^{x} = 7^{-2}

x = -2
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