Question

afla numarul x din egalitatea : 2 la puterea x = 16; 2 la puterea x+1=8;3 la puterea 2x=81; 5 la puterea 2x-1=125

Answer 1

2 la x = 16 => x=4
2 la x+1 = 8 => x = 2
3 la 2x = 81 => x = 2
5 la 2x - 1 = 125 => x = x = 2

Answer 2

2 la puterea x= 16 , x = 4 , 2 la puterea 4= 16
2 la puterea x+1 = 8, 2 la puterea 3 = 8, x = 2
3 la puterea 4 = 81, 2x=4, x=2
5 la puterea 3 = 125, 2x-1 = 3, 2x=4, x=2