3x/(x^2-x-20)

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Solution for 3x/(x^2-x-20) equation: 


D( x )

x^2-x-20 = 0

x^2-x-20 = 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 in (-oo:-4) U (-4:5) U (5:+oo)

(3*x)/(x^2-x-20) = 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

(3*x)/((x+4)*(x-5)) = 0

3*x = 0 // : 3

x = 0

x = 0

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