algebra 2

[sammy7908 offline]

log10 (r+4) - log10 r = log10 (r+1) I don't understand. It says to solve it.

[babu offline]

log (r+4)/r = log (r+1)

(r+4) = r^2+r

r^2 = 4

r = (+2,-2)

[kumold offline]

there should be conditions:
r+4>0
r>0
r+1>0 --->r>0