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D( a )
2*a-9 = 0
a = 0
2*a-9 = 0
2*a-9 = 0
2*a-9 = 0 // + 9
2*a = 9 // : 2
a = 9/2
a = 0
a = 0
a in (-oo:0) U (0:9/2) U (9/2:+oo)
(-a-1)/(2*a-9) = 2/a // - 2/a
(-a-1)/(2*a-9)-(2/a) = 0
(-a-1)/(2*a-9)-2*a^-1 = 0
(-a-1)/(2*a-9)-2/a = 0
(a*(-a-1))/(a*(2*a-9))+(-2*(2*a-9))/(a*(2*a-9)) = 0
a*(-a-1)-2*(2*a-9) = 0
18-a^2-5*a = 0
18-a^2-5*a = 0
18-a^2-5*a = 0
DELTA = (-5)^2-(-1*4*18)
DELTA = 97
DELTA > 0
a = (97^(1/2)+5)/(-1*2) or a = (5-97^(1/2))/(-1*2)
a = (97^(1/2)+5)/(-2) or a = (5-97^(1/2))/(-2)
(a-((97^(1/2)+5)/(-2)))*(a-((5-97^(1/2))/(-2))) = 0
((a-((97^(1/2)+5)/(-2)))*(a-((5-97^(1/2))/(-2))))/(a*(2*a-9)) = 0
((a-((97^(1/2)+5)/(-2)))*(a-((5-97^(1/2))/(-2))))/(a*(2*a-9)) = 0 // * a*(2*a-9)
(a-((97^(1/2)+5)/(-2)))*(a-((5-97^(1/2))/(-2))) = 0
( a-((5-97^(1/2))/(-2)) )
a-((5-97^(1/2))/(-2)) = 0 // + (5-97^(1/2))/(-2)
a = (5-97^(1/2))/(-2)
( a-((97^(1/2)+5)/(-2)) )
a-((97^(1/2)+5)/(-2)) = 0 // + (97^(1/2)+5)/(-2)
a = (97^(1/2)+5)/(-2)
a in { (5-97^(1/2))/(-2), (97^(1/2)+5)/(-2) }
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