Question

[ii] m² - 9n² = ______​

Answer 1

• $\sf{m^2-9n^2 }$

• $\bf{(m)^2-(3n)^2 }$

• $\bold{(m-3n)(m+3n) }$

$\because{\footnotesize{\tt{\blue{[a^2-b^2=(a-b)(a+b) ]}}}}$

Answer 2

Answer:

m²-9n²=m²-(3n)²

=(m+3n)(m-3n)

. :.[a²-b²=(a+b)(a-)]