y^3/2-11y^1/2+28y^-1/2

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Solution for y^3/2-11y^1/2+28y^-1/2 equation:


D( y )

y = 0

y = 0

y = 0

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

(y^3)/2-((11*y^1)/2)+(28*y^-1)/2 = 0

(y^3)/2+(-11/2)*y+(28*y^-1)/2 = 0

1/2*y^3-11/2*y^1+14*y^-1 = 0

(1/2*y^4-11/2*y^2+14*y^0)/(y^1) = 0 // * y^2

y^1*(1/2*y^4-11/2*y^2+14*y^0) = 0

y^1

(1/2)*y^4+(-11/2)*y^2+14 = 0

(1/2)*y^4+(-11/2)*y^2+14 = 0 // * 0

{ 1, -1, 2, -2, 4, -4, 7, -7, 14, -14, 28, -28 }

1

y = 1

y^4-11*y^2+28 = 18

1

-1

y = -1

y^4-11*y^2+28 = 18

-1

2

y = 2

y^4-11*y^2+28 = 0

2

y-2

y^3+2*y^2-7*y-14

y^4-11*y^2+28

y-2

2*y^3-y^4

2*y^3-11*y^2+28

4*y^2-2*y^3

28-7*y^2

7*y^2-14*y

28-14*y

14*y-28

0

y^3+2*y^2-7*y-14 = 0

{ 1, -1, 2, -2, 7, -7, 14, -14 }

1

y = 1

y^3+2*y^2-7*y-14 = -18

1

-1

y = -1

y^3+2*y^2-7*y-14 = -6

-1

2

y = 2

y^3+2*y^2-7*y-14 = -12

2

-2

y = -2

y^3+2*y^2-7*y-14 = 0

-2

y+2

y^2-7

y^3+2*y^2-7*y-14

y+2

-y^3-2*y^2

-7*y-14

7*y+14

0

y^2-7 = 0

DELTA = 0^2-(-7*1*4)

DELTA = 28

DELTA > 0

y = (28^(1/2)+0)/(1*2) or y = (0-28^(1/2))/(1*2)

y = 7^(1/2) or y = -7^(1/2)

y in { -7^(1/2), 7^(1/2), 2, -2}

y in { -7^(1/2), 7^(1/2), 2, -2 }

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