y*y-9/y*y+3y-18

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Solution for y*y-9/y*y+3y-18 equation: 


D( y )

y = 0

y = 0

y = 0

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

y*y+3*y-((9/y)*y)-18 = 0

y*y+3*y-18-9 = 0

y^2+3*y-27 = 0

DELTA = 3^2-(-27*1*4)

DELTA = 117

DELTA > 0

y = (117^(1/2)-3)/(1*2) or y = (-117^(1/2)-3)/(1*2)

y = (3*13^(1/2)-3)/2 or y = (-3*13^(1/2)-3)/2

y in { (-3*13^(1/2)-3)/2, (3*13^(1/2)-3)/2 }

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