Thursday 30 April 2015

LOGARITHMIC FUNCTIONS 2




If F(x) = log5x, Find F(1/625)

Solution

F(x) = log5x

F(1/625) = log5(1/625)

F(1/625) = log3625-1

F(1/625) = log5(54)-1

F(1/625) = log55(4 x -1)

F(1/625) = log55-4

F(1/625) = -4log55

F(1/625) = -4 x 1

F(1/625) = -4


Therefore F(1/625) = -4

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

If F(x) = log3x, Find F(1/243)
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