Question

2^(x+2)-2^(x+1)+2^(x-1)-2^(x-2) = 9

Answer 1

Пошаговое объяснение:

$(2 {}^{4} - 2 {}^{3} + 2 - 1) \times 2 {}^{x - 2} = 9 \\ (16 - 8 + 2 - 1) \times 2 {}^{x - 2} = 9 \\ 9 \times 2 {}^{x - 2} = 9 \\ x = 2$