Question 865809
L=5+4w, wL=51.


{{{w(4w+5)=51}}}
{{{4w^2+5w-51=0}}}.  Try to factor, or....
{{{w=(-25+sqrt(25+4*4*51))/(2*4)=(-25+sqrt(25+16*51))/8}}}
{{{w=(-25+sqrt(841))/8}}}
{{{w=(29-25)/8=4/8}}}
{{{highlight(w=1/2)}}}
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you can finish.