Ответ:
0 \\ {y}^{2} + 8y - 9 = 0 \\ y1 + y2 = - 8 \\ y1 \times y2 = - 9 = > y1 = - 9 \\ y2 = 1 \\ \frac{1}{3} ^{x} = 1 \\ x = 0" alt="( { \frac{1}{3} })^{2x} + 8 {( \frac{1}{3} })^{x} - 9 = 0 \\ \\ { \frac{1}{3} }^{x} = y > 0 \\ {y}^{2} + 8y - 9 = 0 \\ y1 + y2 = - 8 \\ y1 \times y2 = - 9 = > y1 = - 9 \\ y2 = 1 \\ \frac{1}{3} ^{x} = 1 \\ x = 0" align="absmiddle" class="latex-formula">