Question 1146865
Dimensions x and y;
{{{system(xy=1800,x+2y=D)}}}



{{{y=1800/x^2}}}------------mistake here-----the rest needs to be fixed-------



--------------NO-----------based upon above mistake--------------------------
{{{x+2(1800/x^2)=D}}}
{{{x+3600/x^2=D}}}
{{{dD/dx=1+3600*x^(-3)(-2)}}}
{{{dD/dx=1-7200/x^3}}}
{{{dD/dx=(x^3-7200)/x^3}}}


Find x value for {{{x^3=7200}}}.




36*2*10*10
2*3*2*3*2*2*2*5*5
(2^5*3*5^2)
(2^3*2^2)(75)
{{{x=2*root(3,300)}}}
-
{{{y=1800/(2*root(3,300))}}}



If no mistakes made, the total length of fencing:
{{{2*root(3,300)+1800/root(3,300)}}}