(x^2+3x-18)/(x-3)

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Solution for (x^2+3x-18)/(x-3) equation: 


D( x )

x-3 = 0

x-3 = 0

x-3 = 0

x-3 = 0 // + 3

x = 3

x in (-oo:3) U (3:+oo)

(x^2+3*x-18)/(x-3) = 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 = 0

x+6 = 0 // - 6

x = -6

x = -6

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