Question 886057
What is x in log base 5 (x+1) + log base 5(x+21) =3
{{{log(5,(x+1))+log(5,(x+21))=3}}}
{{{log(5,((x+1)(x+21)))=3}}}
(x+1)(x+21)=5^3=125
x^2+22x+441=125
x^2+22x+316=0
solve for x by quadratic formula:
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 
a=1, b=22, c=316
no real solution:
b^2-4ac<0