Question 948808
{{{7*1.09^(4x + 1) = 15}}}
{{{1.09^(4x + 1) = 15/7}}}
{{{4x+1=log(1.09,(15/7))}}}
{{{4x=-1+log(1.09,(15/7))}}}
{{{x=-1/4+(1/4)*log(1.09,(15/7))}}}
{{{x=-1/4+(1/4)*(log((15/7))/log((1.09)))}}}
{{{x=1.960955}}}
To 4 decimal places, x=1.9610