Question

(3a+9b) (3a+9b)
Answer pls

Answer 1

Answer:

(3a)2+(9b)2

9a2+81b2

Answer 2

Step-by-step explanation:

$(3a + 9b)(3a + 9b) \\ = {(3a + 9b) }^{2} \\ = {(3a)}^{2} + {(9b)}^{2} + 2(3a)(9b) \\ = 9 {a}^{2} + 81 {b}^{2} + 54ab$