Question

2the power x -2 the power x - 1 = 4​

Answer 1

${2}^{x} - {2}^{x - 1} = 4 \\ we \: could \: write \\ 2. {2}^{x} - {2}^{x} = {2}^{3} \\ {2}^{x} = {2}^{3} \\ so \: \: \: x = 3$