4x^3+8x^2=15x/9

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Solution for 4x^3+8x^2=15x/9 equation: 


x in (-oo:+oo)

4*x^3+8*x^2 = (15*x)/9 // - (15*x)/9

4*x^3+8*x^2-((15*x)/9) = 0

4*x^3+8*x^2+(-5/3)*x = 0

4*x^3+8*x^2-5/3*x = 0

x*(4*x^2+8*x-5/3) = 0

4*x^2+8*x-5/3 = 0

DELTA = 8^2-(-5/3*4*4)

DELTA = 272/3

DELTA > 0

x = ((272/3)^(1/2)-8)/(2*4) or x = (-(272/3)^(1/2)-8)/(2*4)

x = ((272/3)^(1/2)-8)/8 or x = (-((272/3)^(1/2)+8))/8

x = 0

x = 0

x in { (-((272/3)^(1/2)+8))/8, ((272/3)^(1/2)-8)/8, 0 }

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