Question

${2}^{x +3} + {2}^{x + 2} +{2}^{x} = 40$
va rog ajutati-ma rapidd dau coroana​

Answer 1

Răspuns:

${2}^{x} ( {2}^{3} - {2}^{2} + 1) = 40 \\ {2}^{x} \times 5 = 40 \\ {2}^{3} \times 5 = 40 = > x = 3$