5log4+5log5-5log16+5log1-5log2+5log8-5log25

5log4 + 5log5 - 5log16 + 5log1 - 5log2 + 5log8 - 5log25 = 5log [tex] 2^{2} [/tex] + 1 - 5log [tex] 2^{4} [/tex] + 0 - 5log2 + 5log [tex] 2^{3} [/tex] - 5log [tex] 5^{2} [/tex] = 2(5log2) + 1 - 4(5log2) - 5log2 + 3(5log2) - 2 = (2 - 4 - 1 + 3)(5log2) - 1 = -1