Monday 3 April 2017

LOGARITHMS 10


If Logay = Loga20 +  Loga7 ; find y.

solution

Logay = Loga20 +  Loga7

Logay = Loga(20x 7)         [since Logam +  Logan = Loga(m x n)] 

Logay = Loga140

Hence y = 140                 [since Loga cancels out]


TRY THIS..............................

NECTA 1997 QN 13a



If Logax = Loga5 +  Loga3 ; find x.
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