Question

me ajudem pf galera!!!

Answer 1

Resposta:

Item c) -3

Explicação passo-a-passo:

$-4.2^{x}-4.2^{x+1}+5.2^{x+2}=1\\\\-4.2^{x}-4.2^{x}.2+5.2^{x}.2^{2} =1\\\\-4.2^{x}-8.2^{x}+5.2^{x}.4 =1\\\\-4.2^{x}-8.2^{x}+20.2^{x} =1\\\\-12.2^{x}+20.2^{x} =1\\\\8.2^{x} =1\\\\2^{3}.2^{x}=2^{0}\\  \\\\2^{3+x}=2^{0}\\\\3+x=0\\\\x=-3$