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D( s )
2*s^2-(9*s)+4 = 0
2*s^2-(9*s)+4 = 0
2*s^2-(9*s)+4 = 0
2*s^2-9*s+4 = 0
2*s^2-9*s+4 = 0
DELTA = (-9)^2-(2*4*4)
DELTA = 49
DELTA > 0
s = (49^(1/2)+9)/(2*2) or s = (9-49^(1/2))/(2*2)
s = 4 or s = 1/2
s in (-oo:1/2) U (1/2:4) U (4:+oo)
(2*s^2-(5*s)-12)/(2*s^2-(9*s)+4) = 0
(2*s^2-5*s-12)/(2*s^2-9*s+4) = 0
2*s^2-5*s-12 = 0
2*s^2-5*s-12 = 0
DELTA = (-5)^2-(-12*2*4)
DELTA = 121
DELTA > 0
s = (121^(1/2)+5)/(2*2) or s = (5-121^(1/2))/(2*2)
s = 4 or s = -3/2
(s+3/2)*(s-4) = 0
2*s^2-9*s+4 = 0
2*s^2-9*s+4 = 0
DELTA = (-9)^2-(2*4*4)
DELTA = 49
DELTA > 0
s = (49^(1/2)+9)/(2*2) or s = (9-49^(1/2))/(2*2)
s = 4 or s = 1/2
(s-1/2)*(s-4) = 0
((s+3/2)*(s-4))/((s-1/2)*(s-4)) = 0
( s+3/2 )
s+3/2 = 0 // - 3/2
s = -3/2
( s-4 )
s-4 = 0 // + 4
s = 4
s in { 4}
s = -3/2
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