Question

9la puterea x+1 mai mic sau egalcu 3 la puterea 12

Answer 1

$9^{x+1} \leq 3^{12}$
Notam 9 ca $3^{2}$
si astfel :
$3^{2(x+1)} \leq 3^{12}$
$2(x+1) \leq 12$
$2x+2 \leq 12$
$2x \leq 10$
$x \leq 5$