Thrinayan's answer to Brianca's Secondary 3 A Maths Singapore question.

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
Thrinayan
Thrinayan's answer
1 answers (A Helpful Person)
1st
hope it helps
Boy Mow Chau
Boy Mow Chau
1 year ago
for lg(x) = -1/2,
x must be positive, but lg(x) need not be positive.

x=10^(-1/2) = 0.316227766
check by substituting this value into original equation, it does satisfy the equation!

so there are actually 2 answers! ...
x= 0.316227766 or 1000