Question

9 в -2 степени × 3 в степени х+4=27

Answer 1

${9}^{ - 2} \times {3}^{x + 4} = 27 \\ {3}^{ - 4} \times {3}^{x + 4} = {3}^{3} \\ {3}^{ - 4 + x + 4} = {3}^{3} \\ {3}^{x} = {3}^{3} \\ x = 3$