Question 59222
{{{12000(1 + r^2)= 27000}}}
expand
{{{12000 + 12000*r^2 = 27000}}}
subtract 12000 from both sides
{{{12000*r^2 = 15000}}}
divide both sides by 12000
{{{+r^2 = 15 / 12}}}
{{{r^2 = 5/4}}}
{{{r = 0 +- sqrt(5) / 2}}}
{{{r = + 1.11803}}}
and
{{{r = -1.11803}}}