Question

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4^x-3*2^x=4

Answer 1

$4^{x}-3*2^{x}=4 \ 2^{x}=a;a>0 \ a^{2}-3a-4=0 \ D=25;a_{1}=4;a_{2}=-1 \ 2^{x}=4;2^{x} neq -1 \ 2^{x}=2^{2} \ x=2$