9/b=b/4

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Solution for 9/b=b/4 equation: 


D( b )

b = 0

b = 0

b = 0

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

9/b = b/4 // - b/4

9/b-(b/4) = 0

9*b^-1-1/4*b^1 = 0

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

b^1*(9*b^0-1/4*b^2) = 0

b^1

(-1/4)*b^2+9 = 0

(-1/4)*b^2+9 = 0

DELTA = 0^2-(4*9*(-1/4))

DELTA = 9

DELTA > 0

b = (9^(1/2)+0)/(2*(-1/4)) or b = (0-9^(1/2))/(2*(-1/4))

b = -6 or b = 6

b in { -6, 6} 

b in { -6, 6 }

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