(d-4/4)^2=9

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Solution for (d-4/4)^2=9 equation: 


d in (-oo:+oo)

(d-(4/4))^2 = 9 // - 9

(d-(4/4))^2-9 = 0

(d-1)^2-9 = 0

(d-1)^2-9 = 0

d^2-2*d-8 = 0

d^2-2*d-8 = 0

d^2-2*d-8 = 0

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

DELTA = 36

DELTA > 0

d = (36^(1/2)+2)/(1*2) or d = (2-36^(1/2))/(1*2)

d = 4 or d = -2

(d+2)*(d-4) = 0

(d+2)*(d-4) = 0

( d+2 )

d+2 = 0 // - 2

d = -2

( d-4 )

d-4 = 0 // + 4

d = 4

d in { -2, 4 }

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