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D( y )
y = 0
y^2 = 0
y = 0
y = 0
y^2 = 0
y^2 = 0
1*y^2 = 0 // : 1
y^2 = 0
y = 0
y in (-oo:0) U (0:+oo)
8/y+9/(y^2) = 0
8*y^-1+9*y^-2 = 0
t_1 = y^-1
9*t_1^2+8*t_1^1 = 0
9*t_1^2+8*t_1 = 0
DELTA = 8^2-(0*4*9)
DELTA = 64
DELTA > 0
t_1 = (64^(1/2)-8)/(2*9) or t_1 = (-64^(1/2)-8)/(2*9)
t_1 = 0 or t_1 = -8/9
t_1 = -8/9
y^-1+8/9 = 0
1*y^-1 = -8/9 // : 1
y^-1 = -8/9
-1 < 0
1/(y^1) = -8/9 // * y^1
1 = -8/9*y^1 // : -8/9
-9/8 = y^1
y = -9/8
t_1 = 0
y^-1+0 = 0
y^-1 = 0
1*y^-1 = 0 // : 1
y^-1 = 0
y naleu017Cy do O
y = -9/8
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