Solve ln(x+8) + ln(x-8) =0.
since log(a)+log(b) = log(ab), you have
log (x+8)(x-8) = 0
Since log(1) = 0, you have
x^2-64 = 1
x^2 = 65
x = √65
why not also -√65?
log (x+8)(x-8) = 0
Since log(1) = 0, you have
x^2-64 = 1
x^2 = 65
x = √65
why not also -√65?