Resposta :

MATHSPHIS
[tex]2^x=128 \\ 2^x = 2^7 \\ x=7[/tex]

[tex]B) 5^x=\frac{1}{125} \\ 5^x=(\frac{1}{5})^3 \\ 5^x=5^{-3} \\ x=-3[/tex]

[tex]4^x=512 \\ (2^2)^x = 2^9 \\ 2^{2x}=2^9 \\ 2x=9 \\ x=\frac{9}{2} [/tex]


[tex]2^{x+1}=\frac{1}{4} \\ 2^x = 2^{-2} \\ x=-2[/tex]

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