Respuesta :

CHERLYNnotCHERRY

Answer:

The answer is A.

Step-by-step explanation:

You have to apply :

[tex] {(a - b)}^{2} ⇒ {a}^{2} - 2ab + {b}^{2} [/tex]

So for this question :

[tex] {(3a - b)}^{2} [/tex]

[tex] = {(3a)}^{2} - 2(3a)(b) + {(b)}^{2} [/tex]

[tex] = 9 {a}^{2} - 6ab + {b}^{2} [/tex]