we can re-write the equition as : 5−log10√1+x4log10√1−x=log10(√1+x×√1−x)−1 5−log10√1+x+4log10√1−x=(−1)log10(√1+x)+(−1)log10(√1−x) 5=−log10√1+x+log10√1+x−log10√1−x−4log10√1−x 5=−5log10√1−x √1−x=