(15x^4-9x^3)/(3x^2)

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Solution for (15x^4-9x^3)/(3x^2) equation: 


D( x )

3*x^2 = 0

3*x^2 = 0

3*x^2 = 0

3*x^2 = 0 // : 3

x^2 = 0

x = 0

x in (-oo:0) U (0:+oo)

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

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

15*x^4-9*x^3 = 0

3*x^3*(5*x-3) = 0

5*x-3 = 0 // + 3

5*x = 3 // : 5

x = 3/5

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

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

( 3*x^3 )

3*x^3 = 0 // : 3

x^3 = 0

x = 0

( x-3/5 )

x-3/5 = 0 // + 3/5

x = 3/5

x in { 0} 

x = 3/5

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