Jika ^a log 5 = x dan ^a log 7 = y , maka ^a log √1,4 =...

^alog5 = x dan ^alog7 = y
^alog√1,4 = ^alog√(7/5) = ^alog(√7 / √5)
= ^alog√7 - ^alog√5
= (1/2).^alog7 - (1/2).^alog5
= (1/2)y - (1/2)x, atau
= (1/2)(y - x)