Question 886057
What is x in log base 5 (x+1) + log base 5(x+21) =3
<pre>
{{{log (5, (x + 1)) + log (5, (x + 21)) = 3}}}
{{{log (5, (x + 1)(x + 21)) = 3}}}
{{{log (5, (x^2 + 22x + 21)) = 3}}}
{{{x^2 + 22x + 21 = 5^3}}}
{{{x^2 + 22x + 21 = 125 }}}
{{{x^2 + 22x - 104 = 0}}}
(x - 4)(x + 26) = 0
x – 4 = 0			OR			x + 26 = 0
{{{highlight_green(highlight_green(x = 4))}}}				OR			x = - 26 (ignore) 
You can do the check!! 

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