(x+9)/(x^2-7x-8)

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Solution for (x+9)/(x^2-7x-8) equation: 


D( x )

x^2-(7*x)-8 = 0

x^2-(7*x)-8 = 0

x^2-(7*x)-8 = 0

x^2-7*x-8 = 0

x^2-7*x-8 = 0

DELTA = (-7)^2-(-8*1*4)

DELTA = 81

DELTA > 0

x = (81^(1/2)+7)/(1*2) or x = (7-81^(1/2))/(1*2)

x = 8 or x = -1

x in (-oo:-1) U (-1:8) U (8:+oo)

(x+9)/(x^2-(7*x)-8) = 0

(x+9)/(x^2-7*x-8) = 0

x^2-7*x-8 = 0

x^2-7*x-8 = 0

DELTA = (-7)^2-(-8*1*4)

DELTA = 81

DELTA > 0

x = (81^(1/2)+7)/(1*2) or x = (7-81^(1/2))/(1*2)

x = 8 or x = -1

(x+1)*(x-8) = 0

(x+9)/((x+1)*(x-8)) = 0

x+9 = 0 // - 9

x = -9

x = -9

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