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D( b )
b+1 = 0
b+1 = 0
b+1 = 0
b+1 = 0 // - 1
b = -1
b in (-oo:-1) U (-1:+oo)
4/1-((17/4)*b) = (4*b)/(b+1) // - (4*b)/(b+1)
4/1-((4*b)/(b+1))-((17/4)*b) = 0
(-17/4)*b-4*b*(b+1)^-1+4 = 0
(-4*b)/(b+1)+(-17*b)/4+4 = 0
(-4*4*b)/(4*(b+1))+(-17*b*(b+1))/(4*(b+1))+(4^2*(b+1))/(4*(b+1)) = 0
4^2*(b+1)-17*b*(b+1)-4*4*b = 0
16*b-17*b^2-33*b+16 = 0
16-17*b^2-17*b = 0
16-17*b^2-17*b = 0
16-17*b^2-17*b = 0
DELTA = (-17)^2-(-17*4*16)
DELTA = 1377
DELTA > 0
b = (1377^(1/2)+17)/(-17*2) or b = (17-1377^(1/2))/(-17*2)
b = (9*17^(1/2)+17)/(-34) or b = (17-9*17^(1/2))/(-34)
(b-((9*17^(1/2)+17)/(-34)))*(b-((17-9*17^(1/2))/(-34))) = 0
((b-((9*17^(1/2)+17)/(-34)))*(b-((17-9*17^(1/2))/(-34))))/(4*(b+1)) = 0
((b-((9*17^(1/2)+17)/(-34)))*(b-((17-9*17^(1/2))/(-34))))/(4*(b+1)) = 0 // * 4*(b+1)
(b-((9*17^(1/2)+17)/(-34)))*(b-((17-9*17^(1/2))/(-34))) = 0
( b-((17-9*17^(1/2))/(-34)) )
b-((17-9*17^(1/2))/(-34)) = 0 // + (17-9*17^(1/2))/(-34)
b = (17-9*17^(1/2))/(-34)
( b-((9*17^(1/2)+17)/(-34)) )
b-((9*17^(1/2)+17)/(-34)) = 0 // + (9*17^(1/2)+17)/(-34)
b = (9*17^(1/2)+17)/(-34)
b in { (17-9*17^(1/2))/(-34), (9*17^(1/2)+17)/(-34) }
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