12.5-21000/y^2

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Solution for 12.5-21000/y^2 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)

12.5-(21000/(y^2)) = 0

12.5-21000*y^-2 = 0

-21000*y^-2 = -12.5 // : -21000

y^-2 = 0.00059524

-2 < 0

1/(y^2) = 0.00059524 // * y^2

1 = 0.00059524*y^2 // : 0.00059524

1679.99462402 = y^2

y^2 = 1679.99462402 // ^ 1/2

abs(y) = 1679.99462402^(1/2)

y = 1679.99462402^(1/2) or y = -1679.99462402^(1/2)

y in { 1679.99462402^(1/2), -1679.99462402^(1/2) }

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