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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
70-(7*x)-((10*x)/(x^2)) = 0
70-7*x-10*x^-1 = 0
70*x^0-7*x^1-10*x^-1 = 0
(70*x^1-7*x^2-10*x^0)/(x^1) = 0 // * x^2
x^1*(70*x^1-7*x^2-10*x^0) = 0
x^1
70*x-7*x^2-10 = 0
70*x-7*x^2-10 = 0
DELTA = 70^2-(-10*(-7)*4)
DELTA = 4620
DELTA > 0
x = (4620^(1/2)-70)/(-7*2) or x = (-4620^(1/2)-70)/(-7*2)
x = (2*1155^(1/2)-70)/(-14) or x = (-2*1155^(1/2)-70)/(-14)
x in { (2*1155^(1/2)-70)/(-14), (-2*1155^(1/2)-70)/(-14)}
x in { (2*1155^(1/2)-70)/(-14), (-2*1155^(1/2)-70)/(-14) }
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