Question

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Answer 1

$4 ^{x} +4 ^{x+1}= \frac{5}{4} \\ \\ 4 ^{x} +4*4 ^{x} =\frac{5}{4} \\ \\ 4 ^{x} *(1+4)=\frac{5}{4} \\ \\ 4 ^{x}*5=\frac{5}{4} \\ \\ 4 ^{x}=\frac{1}{4} \\ \\ 4^{x}= 4^{-1} \\ \\ x=-1$