(a2+10a+21)/(a+3)

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Solution for (a2+10a+21)/(a+3) equation: 


D( a )

a+3 = 0

a+3 = 0

a+3 = 0

a+3 = 0 // - 3

a = -3

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

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

a^2+10*a+21 = 0

a^2+10*a+21 = 0

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

DELTA = 16

DELTA > 0

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

a = -3 or a = -7

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

a+7 = 0

a+7 = 0 // - 7

a = -7

a = -7

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