2l+2(100/l)=50

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Solution for 2l+2(100/l)=50 equation: 


D( l )

l = 0

l = 0

l = 0

l in (-oo:0) U (0:+oo)

2*l+2*(100/l) = 50 // - 50

2*l+2*(100/l)-50 = 0

2*l^1+200*l^-1-50*l^0 = 0

(2*l^2-50*l^1+200*l^0)/(l^1) = 0 // * l^2

l^1*(2*l^2-50*l^1+200*l^0) = 0

l^1

2*l^2-50*l+200 = 0

2*l^2-50*l+200 = 0

DELTA = (-50)^2-(2*4*200)

DELTA = 900

DELTA > 0

l = (900^(1/2)+50)/(2*2) or l = (50-900^(1/2))/(2*2)

l = 20 or l = 5

l in { 5, 20} 

l in { 5, 20 }

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