(2x^2+20x+18)/(x+9)

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Solution for (2x^2+20x+18)/(x+9) equation: 


D( x )

x+9 = 0

x+9 = 0

x+9 = 0

x+9 = 0 // - 9

x = -9

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

(2*x^2+20*x+18)/(x+9) = 0

2*x^2+20*x+18 = 0

2*(x^2+10*x+9) = 0

x^2+10*x+9 = 0

DELTA = 10^2-(1*4*9)

DELTA = 64

DELTA > 0

x = (64^(1/2)-10)/(1*2) or x = (-64^(1/2)-10)/(1*2)

x = -1 or x = -9

2*(x+9)*(x+1) = 0

2*(x+1) = 0

x+1 = 0 // - 1

x = -1

x = -1

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