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D( x )
x^2-(16*x)+63 = 0
x^2-(16*x)+63 = 0
x^2-(16*x)+63 = 0
x^2-16*x+63 = 0
x^2-16*x+63 = 0
DELTA = (-16)^2-(1*4*63)
DELTA = 4
DELTA > 0
x = (4^(1/2)+16)/(1*2) or x = (16-4^(1/2))/(1*2)
x = 9 or x = 7
x in (-oo:7) U (7:9) U (9:+oo)
(10*x-70)/(x^2-(16*x)+63) = 0
(10*x-70)/(x^2-16*x+63) = 0
x^2-16*x+63 = 0
x^2-16*x+63 = 0
DELTA = (-16)^2-(1*4*63)
DELTA = 4
DELTA > 0
x = (4^(1/2)+16)/(1*2) or x = (16-4^(1/2))/(1*2)
x = 9 or x = 7
(x-7)*(x-9) = 0
(10*x-70)/((x-7)*(x-9)) = 0
10*x-70 = 0 // + 70
10*x = 70 // : 10
x = 70/10
x = 7
x in { 7}
x belongs to the empty set
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