9-y^2/y^2-4y-21

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Solution for 9-y^2/y^2-4y-21 equation: 


D( y )

y^2 = 0

y^2 = 0

y^2 = 0

1*y^2 = 0 // : 1

y^2 = 0

y = 0

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

9-(4*y)-((y^2)/(y^2))-21 = 0

9-4*y-21-1 = 0

-4*y-13 = 0 // + 13

-4*y = 13 // : -4

y = 13/(-4)

y = -13/4

y = -13/4

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