(2x+18)/(x^2+11x+18)

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Solution for (2x+18)/(x^2+11x+18) equation: 


D( x )

x^2+11*x+18 = 0

x^2+11*x+18 = 0

x^2+11*x+18 = 0

x^2+11*x+18 = 0

DELTA = 11^2-(1*4*18)

DELTA = 49

DELTA > 0

x = (49^(1/2)-11)/(1*2) or x = (-49^(1/2)-11)/(1*2)

x = -2 or x = -9

x in (-oo:-9) U (-9:-2) U (-2:+oo)

(2*x+18)/(x^2+11*x+18) = 0

x^2+11*x+18 = 0

x^2+11*x+18 = 0

DELTA = 11^2-(1*4*18)

DELTA = 49

DELTA > 0

x = (49^(1/2)-11)/(1*2) or x = (-49^(1/2)-11)/(1*2)

x = -2 or x = -9

(x+9)*(x+2) = 0

(2*x+18)/((x+9)*(x+2)) = 0

2*x+18 = 0 // - 18

2*x = -18 // : 2

x = -18/2

x = -9

x in { -9} 

x belongs to the empty set

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