Question

Q 3) (m+ 3n) (m- 3n)​

Answer 1

Answer:

this formula is (a+b) (a-b)

Answer 2

Answer:

m² - 9n²

Step-by-step explanation:

$= (m + 3n)(m - 3n) \\ > > (a + b)(a - b) = {a}^{2} - {b}^{2} < < \\ = {m}^{2} - {(3n)}^{2} \\ = {m}^{2} - 9 {n}^{2}$