Question 881262
Solve for x:
{{{ log (21, (x+84) ) = 3-log (21,x) }}}
{{{ log (21, (x+84) )+log (21,x) = 3 }}}
{{{ log (21, (x+84)(x)) = 3 }}}
21^3=x^2+84x
x^2+84x-9261=0
(x+147)(x-63)=0
x=-147 (reject, (x+84)>0)
or
x=63