Question

10^3x=125 find x without using log

Answer 1

let 10^x = r

then ,

10^3(x) = 125

r³ = 125

(r³ -125) =0

(r -5)(r² +5r +25) =0

r² +5r + 25 ≠ 0
so, r = 5

10^x = 5
now, here without log you can't find ,

so, x = log5