Question

(poza mai sus)de la punctul c la k

Answer 1

8^3x=(8^2)^3
8^3x=262144
2^9x=2^18
9x=18
x=2

2^x+2^(x+1)+2^(x+2)=56
notam 2^x cu y: 7*2^x=7y
=> 7y=56
y=8
revenim la notatie:
2^x = 8
2^x =2^3
x=3