(d-4/4)^2=81

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Solution for (d-4/4)^2=81 equation: 


d in (-oo:+oo)

(d-(4/4))^2 = 81 // - 81

(d-(4/4))^2-81 = 0

(d-1)^2-81 = 0

(d-1)^2-81 = 0

d^2-2*d-80 = 0

d^2-2*d-80 = 0

d^2-2*d-80 = 0

DELTA = (-2)^2-(-80*1*4)

DELTA = 324

DELTA > 0

d = (324^(1/2)+2)/(1*2) or d = (2-324^(1/2))/(1*2)

d = 10 or d = -8

(d+8)*(d-10) = 0

(d+8)*(d-10) = 0

( d+8 )

d+8 = 0 // - 8

d = -8

( d-10 )

d-10 = 0 // + 10

d = 10

d in { -8, 10 }

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