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Equações exponencial,procurei em livros mas nao encontrei
Preciso da ajuda de alguem para resolver estas equações para dever do colégio, pois procurei em livros e não consegui entender,alguem para me ajudar é melhor que alem de fazer o dever eu ainda vou sair bem na prova.
primeira: 3^(x+1) + 3^(x+2) = 12?
segunda: (1 sobre nove )^ -x+3 = ( 1 sobre 27)^2x-1 ?
Terceira: (?2)^x = 64
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