((d-4)/4)^2=64

Solution for ((d-4)/4)^2=64 equation:

d in (-oo:+oo)

((d-4)/4)^2 = 64 // - 64

((d-4)/4)^2-64 = 0

((d-4)^2)/(4^2)-64 = 0

((d-4)^2)/(4^2)+(-64*4^2)/(4^2) = 0

(d-4)^2-64*4^2 = 0

d^2-8*d-1008 = 0

d^2-8*d-1008 = 0

d^2-8*d-1008 = 0

DELTA = (-8)^2-(-1008*1*4)

DELTA = 4096

DELTA > 0

d = (4096^(1/2)+8)/(1*2) or d = (8-4096^(1/2))/(1*2)

d = 36 or d = -28

(d+28)*(d-36) = 0

((d+28)*(d-36))/(4^2) = 0

((d+28)*(d-36))/(4^2) = 0 // * 16

(d+28)*(d-36) = 0

( d+28 )

d+28 = 0 // - 28

d = -28

( d-36 )

d-36 = 0 // + 36

d = 36

d in { -28, 36 }