(x-4)/(x^2-3x-28)

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Solution for (x-4)/(x^2-3x-28) equation: 


D( x )

x^2-(3*x)-28 = 0

x^2-(3*x)-28 = 0

x^2-(3*x)-28 = 0

x^2-3*x-28 = 0

x^2-3*x-28 = 0

DELTA = (-3)^2-(-28*1*4)

DELTA = 121

DELTA > 0

x = (121^(1/2)+3)/(1*2) or x = (3-121^(1/2))/(1*2)

x = 7 or x = -4

x in (-oo:-4) U (-4:7) U (7:+oo)

(x-4)/(x^2-(3*x)-28) = 0

(x-4)/(x^2-3*x-28) = 0

x^2-3*x-28 = 0

x^2-3*x-28 = 0

DELTA = (-3)^2-(-28*1*4)

DELTA = 121

DELTA > 0

x = (121^(1/2)+3)/(1*2) or x = (3-121^(1/2))/(1*2)

x = 7 or x = -4

(x+4)*(x-7) = 0

(x-4)/((x+4)*(x-7)) = 0

x-4 = 0 // + 4

x = 4

x = 4

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