(d-4/4)^2=121

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Solution for (d-4/4)^2=121 equation: 


d in (-oo:+oo)

(d-(4/4))^2 = 121 // - 121

(d-(4/4))^2-121 = 0

(d-1)^2-121 = 0

(d-1)^2-121 = 0

d^2-2*d-120 = 0

d^2-2*d-120 = 0

d^2-2*d-120 = 0

DELTA = (-2)^2-(-120*1*4)

DELTA = 484

DELTA > 0

d = (484^(1/2)+2)/(1*2) or d = (2-484^(1/2))/(1*2)

d = 12 or d = -10

(d+10)*(d-12) = 0

(d+10)*(d-12) = 0

( d+10 )

d+10 = 0 // - 10

d = -10

( d-12 )

d-12 = 0 // + 12

d = 12

d in { -10, 12 }

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