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D( x )
x^2-(2*x)-63 = 0
x^2-(2*x)-63 = 0
x^2-(2*x)-63 = 0
x^2-2*x-63 = 0
x^2-2*x-63 = 0
DELTA = (-2)^2-(-63*1*4)
DELTA = 256
DELTA > 0
x = (256^(1/2)+2)/(1*2) or x = (2-256^(1/2))/(1*2)
x = 9 or x = -7
x in (-oo:-7) U (-7:9) U (9:+oo)
(4*x^2-(9*x))/(x^2-(2*x)-63) = 0
(4*x^2-9*x)/(x^2-2*x-63) = 0
4*x^2-9*x = 0
x*(4*x-9) = 0
4*x-9 = 0 // + 9
4*x = 9 // : 4
x = 9/4
x*(x-9/4) = 0
x^2-2*x-63 = 0
x^2-2*x-63 = 0
DELTA = (-2)^2-(-63*1*4)
DELTA = 256
DELTA > 0
x = (256^(1/2)+2)/(1*2) or x = (2-256^(1/2))/(1*2)
x = 9 or x = -7
(x+7)*(x-9) = 0
(x*(x-9/4))/((x+7)*(x-9)) = 0
( x-9/4 )
x-9/4 = 0 // + 9/4
x = 9/4
( x )
x = 0
x in { 9/4, 0 }
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