Question

11. Тендеудi шешiнiз: 3^(x+3) - 3^(x+1) = 216

Answer 1

$3^(^x^+^3^)-3^(^x^+^1^)=216;\\3^x^*3^3-3^x*3^1=216$

27*3ˣ-3*3ˣ=216;

24*3ˣ=216;

3ˣ=216:24

3ˣ=9

3ˣ=3²

x=2