tolong donk bagaimana carax itu

[tex](3a + y)^{2} \\ =(3a +y)(3a + y) \\ = 9 {a}^{2} + 3ay + 3ay + {y}^{2} \\ = 9 {a}^{2} + 6ay + {y}^{2} [/tex]
Jawaban ny yg A

Semoga dapat dipahami