Question 319652
Is this it:
{{{3^(x+3) + 3^x = 84}}} ?
A general rule is:
{{{a^(b + c) = a^b*a^c}}}, so I can rewrite as
{{{3^x*3^3 + 3^x = 84}}}
Then I can factor out {{{3^x}}}
{{{3^x*(3^3 + 1) = 84}}}
{{{10*3^x = 84}}}
{{{3^x = 8.4}}}
{{{log(3^x) = log(8.4)}}}
{{{x*log(3) = log(8.4)}}}
{{{x = log(8.4)/log(3)}}}
{{{x = .92428/.47712}}}
{{{x = 1.93721}}}