Respuesta :

Answer:

The answer is 12x + 4x².

Step-by-step explanation:

You have to expand it using Distributive Law :

[tex]4x(3 + x)[/tex]

[tex] = 4x(3) + 4x(x)[/tex]

[tex] = 12x + 4 {x}^{2} [/tex]

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