Question

Срочно лёгкое задание 18 баллов

Answer 1

Ответ:

${2}^{x + 3} + {2}^{x + 1} - 7 \times {2}^{x} = 48 \\ {2}^{x} \times {2}^{3} + {2}^{x} \times 2 - 7 \times {2}^{x} = 48 \\ t \times 8 + t \times 2 - 7 \times t = 48 \\ 8t + 2t - 7t = 48 \\ 3t = 48 \\ t = 16 \\ {2}^{x} = 16 \\ {2}^{x} = {2}^{4} \\ x = 4$

Answer 2

Ответ:

$2^{x+3}+2^{x+1}-7\cdot 2^{x}=48\\\\8\cdot 2^{x}+2\cdot 2^{x}-7\cdot 2^{x}=48\\\\3\cdot 2^{x}=48\\\\2^{x}=16\\\\2^{x}=2^4\\\\\underline {\ x=4\ }$