15x^4-15x^3-25x/10x

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Solution for 15x^4-15x^3-25x/10x equation: 


x in (-oo:+oo)

15*x^4-(15*x^3)-(((25*x)/10)*x) = 0

15*x^4-15*x^3+(-5/2)*x^2 = 0

15*x^4-15*x^3-5/2*x^2 = 0

5*x^2*(3*x^2-3*x-1/2) = 0

3*x^2-3*x-1/2 = 0

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

DELTA = 15

DELTA > 0

x = (15^(1/2)+3)/(2*3) or x = (3-15^(1/2))/(2*3)

x = (15^(1/2)+3)/6 or x = (3-15^(1/2))/6

5*x^2 = 0

5*x^2 = 0 // : 5

x^2 = 0

x = 0

x in { (3-15^(1/2))/6, (15^(1/2)+3)/6, 0 }

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