Question

3^(x-1) - 3^(x)+ 3 ^(x+1)=63

Answer 1

3^(x-1) - 3^(x)+ 3 ^(x+1)=63
3ˣ/3-3ˣ+3ˣ*3=63
(3ˣ-3ˣ*3+3ˣ*3²)/3=(63*3)/3
3ˣ-3ˣ*3+3ˣ*3²=189
3ˣ(1-3+9)=189
3ˣ*7=189
3ˣ=189/7
3ˣ=27
x=3