Question

aflati x.
5x3 la puterea x - 2x3 la puterea x = 81
Ajutor dau 20 de puncte

Answer 1

5 x 3ˣ - 2 x 3ˣ = 9²

3ˣ × ( 5 - 2 ) = ( 3² )²

3ˣ × 3 = 3⁴

3ˣ + 1 = 3⁴

x + 1 = 4

x = 4 - 1

x = 3