8log 7 =p, maka 16 log 28=

8log7 = p
²^³log 7 = p
16log28 = 8log28/8log16
= (8log4 + 8log7)/(8log8 + 8log2)
= ( ⅔ + p)/( 1 + ⅓)
= (⅔ + p) / (4/3)
= ¾(⅔ + p )
= ½ + ¾p
= ¼(2 + 3p)