Respostas

2014-05-29T22:28:27-03:00
Olá Camila,  

0,25^2^x^+^3=4^x^-^1 \\ 
(1/4)^2^x^+^3=4^x^-^1 \\4^-^1)^2^x^+^3=4^x^-^1\\  \not4^-^2^x^-^3= \not4^x^-^1 \\ -2x-3=x-1 \\ -2x-x=-1+3 \\-3x=2 \\ x=-2/3

Espero ter ajudado e tenha ótimos estudos =)
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2014-05-29T22:31:10-03:00
0,25^2x+3=4^x-1----->(1/4)^2x+3=4^x-1----->4^-2x-3=4^x-1----> -2x-3=x-1 ----> x=-2/3
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