Question 27771
(25+x)(40+x)=1426
{{{1000+x^2+25x+40x=1426}}}
{{{x^2+65x+1000-1426}}}
{{{x^2+65x-426=0}}}


Factor: (x+71) and (x-6)


Remove the negative left with x= 6.


Hence, the uniform path is 6cm.
Paul.