אקמול, מהר!!
log2(4x-1-1) = log215 + x - 3
log2[(4x-1-1)/15] = x - 3
15 2x-3 = 4x-1 - 1
(15 2x)/8 = 22x/4 - 1 \ t = 2x
15t = 2t2 - 8
2t2 - 15t - 8 = 0
t1,2 = [15 +- V(289)]/4
t1 = 8
2x = 8 = 23
x = 3
t2 = -.5
2x = -.5
x = ..
x = 3
DJ Shadow - The Number Song