(x^2+20x+91)/(x+7)

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Solution for (x^2+20x+91)/(x+7) equation: 


D( x )

x+7 = 0

x+7 = 0

x+7 = 0

x+7 = 0 // - 7

x = -7

x in (-oo:-7) U (-7:+oo)

(x^2+20*x+91)/(x+7) = 0

x^2+20*x+91 = 0

x^2+20*x+91 = 0

DELTA = 20^2-(1*4*91)

DELTA = 36

DELTA > 0

x = (36^(1/2)-20)/(1*2) or x = (-36^(1/2)-20)/(1*2)

x = -7 or x = -13

(x+13)*(x+7) = 0

x+13 = 0

x+13 = 0 // - 13

x = -13

x = -13

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