(X^2-X-20)/(X-5)

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Solution for (X^2-X-20)/(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-X-20)/(X-5) = 0

X^2-X-20 = 0

X^2-X-20 = 0

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

DELTA = 81

DELTA > 0

X = (81^(1/2)+1)/(1*2) or X = (1-81^(1/2))/(1*2)

X = 5 or X = -4

(X+4)*(X-5) = 0

X+4 = 0

X+4 = 0 // - 4

X = -4

X = -4

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