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D( x )
x^2-36 = 0
x^2-36 = 0
x^2-36 = 0
1*x^2 = 36 // : 1
x^2 = 36
x^2 = 36 // ^ 1/2
abs(x) = 6
x = 6 or x = -6
x in (-oo:-6) U (-6:6) U (6:+oo)
(x^2+3*x-18)/(x^2-36) = 0
x^2+3*x-18 = 0
x^2+3*x-18 = 0
DELTA = 3^2-(-18*1*4)
DELTA = 81
DELTA > 0
x = (81^(1/2)-3)/(1*2) or x = (-81^(1/2)-3)/(1*2)
x = 3 or x = -6
(x+6)*(x-3) = 0
((x+6)*(x-3))/(x^2-36) = 0
( x+6 )
x+6 = 0 // - 6
x = -6
( x-3 )
x-3 = 0 // + 3
x = 3
x in { -6}
x = 3
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