7n=20/n

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Solution for 7n=20/n equation: 


D( n )

n = 0

n = 0

n = 0

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

7*n = 20/n // - 20/n

7*n-(20/n) = 0

7*n-20*n^-1 = 0

7*n^1-20*n^-1 = 0

(7*n^2-20*n^0)/(n^1) = 0 // * n^2

n^1*(7*n^2-20*n^0) = 0

n^1

7*n^2-20 = 0

7*n^2-20 = 0

DELTA = 0^2-(-20*4*7)

DELTA = 560

DELTA > 0

n = (560^(1/2)+0)/(2*7) or n = (0-560^(1/2))/(2*7)

n = (2*35^(1/2))/7 or n = (-2*35^(1/2))/7

n in { (-2*35^(1/2))/7, (2*35^(1/2))/7} 

n in { (-2*35^(1/2))/7, (2*35^(1/2))/7 }

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