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D( x )
-7*x^2 = 0
-7*x^2 = 0
-7*x^2 = 0
-7*x^2 = 0 // : -7
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(63*x^5-(28*x^4)-(35*x^2))/(-7*x^2) = 0
(63*x^5-28*x^4-35*x^2)/(-7*x^2) = 0
63*x^5-28*x^4-35*x^2 = 0
7*x^2*(9*x^3-4*x^2-5) = 0
9*x^3-4*x^2-5 = 0
{ 1, -1, 5, -5 }
1
x = 1
9*x^3-4*x^2-5 = 0
1
x-1
9*x^2+5*x+5
9*x^3-4*x^2-5
x-1
9*x^2-9*x^3
5*x^2-5
5*x-5*x^2
5*x-5
5-5*x
0
9*x^2+5*x+5 = 0
DELTA = 5^2-(4*5*9)
DELTA = -155
DELTA < 0
x in { 1}
7*x^2*(x-1) = 0
(7*x^2*(x-1))/(-7*x^2) = 0
( 7*x^2 )
7*x^2 = 0 // : 7
x^2 = 0
x = 0
( x-1 )
x-1 = 0 // + 1
x = 1
x in { 0}
x = 1
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