Respuesta :

Answer:

x = -1 or 5

Step-by-step explanation:

3x^3-12x^2-15x=0

Divide all by 3x.

x^2-4x-5=0

Find the factors of -5 that add up to -4.

This will be 1 and -5.

(x+1)(x-5)=0

x+1=0

x= -1

x-5=0

x=5

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