Question 668741
252 = (l)(w)
252 = (w+9)(w)
252 = {{{w^2 + 9w}}}
{{{w^2 + 9w - 252 = 0}}}
...
(w+21)(w-12) = 0
w+21=0, so w=-21 : width cannot be negative
w-12=0, so {{{highlight_green(w=12)}}} in
...
{{{l = 12 + 9 = highlight(l=21)}}} in
...
Check {{{cartoon(
12(21),
252)}}}
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