LOGARITHMS 12

Find x if Log_x0.00001 = -5

solution

Log_x0.0000001 = -7

0.0000001  = x^-7 .    [0.00000001  = 10^-7  ]

10^-7 = x^-7 .

10⁷ = x⁷ .  { equal powers cancel out}

x = 10

Hence x = 10

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

Find x if Log_x128 = 7