Question

a raiz da equação log de base 2 x + log de base 4x = 9. a) 16. b) 32. c) 4. d) -2. e) 64​

Answer 1

log2 x + log4 x = 9

log2 x + log2 x/log2 4 = 9

log2 x + log2 x/ 2 = 9. ==> *(2) mmc

2log2 x + log2 x = 18

3log2 x = 18

log2 x = 6

x = 2⁶

x = 64