Question

2x+2x+1 + 2x+2 + 2x+3= 15/2

Answer 1

2x+2x+1 + 2x+2 + 2x+3= 15/2

2^x +2^(x+1) +2^(x+2) +2^(x+3)=15/2

2^(x)  + 2^(x)*2 +2^(x)*2² +2^(x) * 2³ =15/2

2^(x) * [1 +2 +4 +8] =15/2

2^(x) * 15 =15/2

2^x=1/2

2^(x)=2^(-1)

x=-1