Jawabanmu

2014-09-07T20:38:01+07:00
2∧x + z∧x+3 = 72
x = 3 

saya daptnya pake logika, gak pake cara 
2014-09-07T20:39:29+07:00
2^x + 2^(x+3) = 72
2^x + 2^x + 2^3 = 72
2.2^x + 8 = 72
2.2^x = 64
2^x = 32
2^x = 2^5
x = 5