(x^2-2x-15)/(x-5)

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Solution for (x^2-2x-15)/(x-5) equation: 


D( x )

x-5 = 0

x-5 = 0

x-5 = 0

x-5 = 0 // + 5

x = 5

x in (-oo:5) U (5:+oo)

(x^2-(2*x)-15)/(x-5) = 0

(x^2-2*x-15)/(x-5) = 0

x^2-2*x-15 = 0

x^2-2*x-15 = 0

DELTA = (-2)^2-(-15*1*4)

DELTA = 64

DELTA > 0

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

x = 5 or x = -3

(x+3)*(x-5) = 0

x+3 = 0

x+3 = 0 // - 3

x = -3

x = -3

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