Jawabanmu

2014-09-10T20:03:13+07:00
2^{4(x-2)} = 2^{-5(2x-8)} 
2^{4x-8} = 2^{-10x-40} 
4x-8 = -10x-40  
14x = -32
x =  \frac{7}{16}
makasih. aku ada satu lagi, (1/25)^-x^2+6x-7 = 5^x^2-2x+5