Question 877946
{{{w=-4+(1/2)L}}} and {{{wL=42}}}.


The first part can be stated, {{{w=L/2-4}}}.


{{{(L/2-4)L=42}}}
{{{L^2/2-4L=42}}}
{{{L^2-8L=84}}}
{{{L^2-8L-84=0}}}, factorable?
{{{(L+6)(L-14)=0}}}
Choose {{{highlight(L=14)}}}.
{{{w=14/2-4=7-4=highlight(3=w)}}}.