4*b=16/b

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Solution for 4*b=16/b equation: 


D( b )

b = 0

b = 0

b = 0

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

4*b = 16/b // - 16/b

4*b-(16/b) = 0

4*b-16*b^-1 = 0

4*b^1-16*b^-1 = 0

(4*b^2-16*b^0)/(b^1) = 0 // * b^2

b^1*(4*b^2-16*b^0) = 0

b^1

4*b^2-16 = 0

4*b^2-16 = 0

DELTA = 0^2-(-16*4*4)

DELTA = 256

DELTA > 0

b = (256^(1/2)+0)/(2*4) or b = (0-256^(1/2))/(2*4)

b = 2 or b = -2

b in { -2, 2} 

b in { -2, 2 }

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