Question 1130918
w, width
8w+10,length

{{{w(8w+10)=7500}}}
{{{2w(4w+5)=2*3750}}}
{{{w(4w+5)=3750}}}
{{{4w^2+5w-3750=0}}}

discriminant, {{{60025=245^2}}}

{{{w=(-5+245)/8}}}

{{{highlight(w=30)}}}

{{{highlight(8w+10=250)}}}