LOGARITHMS 2

Find x if Log_x 78125 = 7

Solution

Log_x 78125 = 7

78125 = x⁷ . [changing into exponential form]

5⁷ = x⁷ .

5⁷ = x⁷ .    [ cancelling the powers]

x = 5

Hence x = 5

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

NECTA F-IV, 1999 QN. 3b (ii)

Find x if Log_x32 = 5