SOLUTION: solve for x log(base 10)X+log(base 10)(X+1) = log(base 10)12

Algebra ->  Exponential-and-logarithmic-functions -> SOLUTION: solve for x log(base 10)X+log(base 10)(X+1) = log(base 10)12      Log On


   

Question 436260: solve for x
log(base 10)X+log(base 10)(X+1) = log(base 10)12
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
log(base 10)X+log(base 10)(X+1) = log(base 10)12
log(base 10)X(X+1) = log(base 10)12
X(X+1) = 12
X^2+X = 12
X^2+X-12 = 0
(X+4)(X-3) = 0
X = {-4,3}
Throw out the negative solution (extraneous) leaving:
X = 3