(4x^2+18x+21)/(x+3)

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Solution for (4x^2+18x+21)/(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)

(4*x^2+18*x+21)/(x+3) = 0

4*x^2+18*x+21 = 0

4*x^2+18*x+21 = 0

DELTA = 18^2-(4*4*21)

DELTA = -12

DELTA < 0

1 = 0

1/(x+3) = 0

x belongs to the empty set

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