Question 1054152
{{{h=6+b}}}
{{{A=(1/2)bh=216}}
{{{bh=432}}}
{{{b(6+b)=432}}}
{{{b^2+6b-432=0}}}
{{{(b-18)(b+24)=0}}}
Only positive values of b make sense,
{{{b-18=0}}}
{{{b=18}}}{{{yds}}}
Then,
{{{h=6+18}}}
{{{h=24}}}{{{yds}}}