(4b^2-64)/(-4b+16)

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Solution for (4b^2-64)/(-4b+16) equation: 


D( b )

16-4*b = 0

16-4*b = 0

16-4*b = 0

16-4*b = 0 // - 16

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

b = -16/(-4)

b = 4

b in (-oo:4) U (4:+oo)

(4*b^2-64)/(16-4*b) = 0

4*b^2 = 64 // : 4

b^2 = 16

b^2 = 16 // ^ 1/2

abs(b) = 4

b = 4 or b = -4

b in { 4} 

b = -4

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