Question

9 power x + 9 power x-1 = 90

Answer 1

Step-by-step explanation:

${9}^{x} + {9}^{x - 1} = 90$

${9}^{x} (1 + \frac{1}{9} ) = 90$

${9}^{x} \times \frac{10}{9} = 90$

${9}^{x} = 81$

9²=81

so compare

${9}^{x} = {9}^{2}$

x=2

(◍•ᴗ•◍)

Answer 2

Answer:

x=9. is the answer

Step-by-step explanation:

hope you like the answer