(5/(7x^2))+(3/(8x))

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Solution for (5/(7x^2))+(3/(8x)) equation: 


D( x )

7*x^2 = 0

8*x = 0

7*x^2 = 0

7*x^2 = 0

7*x^2 = 0 // : 7

x^2 = 0

x = 0

8*x = 0

8*x = 0

8*x = 0 // : 8

x = 0

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

3/(8*x)+5/(7*x^2) = 0

3/8*x^-1+5/7*x^-2 = 0

t_1 = x^-1

5/7*t_1^2+3/8*t_1^1 = 0

5/7*t_1^2+3/8*t_1 = 0

DELTA = (3/8)^2-(0*5/7*4)

DELTA = 9/64

DELTA > 0

t_1 = ((9/64)^(1/2)-3/8)/(5/7*2) or t_1 = (-(9/64)^(1/2)-3/8)/(5/7*2)

t_1 = 0 or t_1 = -21/40

t_1 = -21/40

x^-1+21/40 = 0

1*x^-1 = -21/40 // : 1

x^-1 = -21/40

-1 < 0

1/(x^1) = -21/40 // * x^1

1 = -21/40*x^1 // : -21/40

-40/21 = x^1

x = -40/21

t_1 = 0

x^-1+0 = 0

x^-1 = 0

1*x^-1 = 0 // : 1

x^-1 = 0

x naleu017Cy do O

x = -40/21

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