Respuesta :

distributive property
a(b+c)=ab+ac
remember
(x^m)(x^n)=x^(m+n)

so

3x(x^2+4)=
(3x)(x^2)+(3x)(4)=
(3x^3)+(12x)=
3x^3+12x

Answer:

C

Step-by-step explanation:

Correct on edge :)

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