(x2+10x+21)/(x+3)

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Solution for (x2+10x+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)

(x^2+10*x+21)/(x+3) = 0

x^2+10*x+21 = 0

x^2+10*x+21 = 0

DELTA = 10^2-(1*4*21)

DELTA = 16

DELTA > 0

x = (16^(1/2)-10)/(1*2) or x = (-16^(1/2)-10)/(1*2)

x = -3 or x = -7

(x+7)*(x+3) = 0

x+7 = 0

x+7 = 0 // - 7

x = -7

x = -7

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