[tex]a) log_{13} ( \frac{-x}{2} +3) = 0
13^0 = \frac{-x}{2} + 3
1 = (-x/2) + 3
x/2 = 3-1
x /2 = 2
x=4[/tex]
[tex]b) -5/7 - log(x) =0
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-5/7 = log(x)
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10^{-5/7} = x
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x = 1/10^{5/7}
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x = 1/ \sqrt[7]{10^5}
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x = \sqrt[7]{10^2} /10[/tex]
[tex]c) -2,3^x - 1 =0
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-2,3^x = 1
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Todo numero elevado a la cero (0) , da 1 , por lo tanto:
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x =0[/tex]