Factories the following

m² – 121

In given expression

Both terms are perfect square

⇒ m² = m × m

⇒ 121 = 11 × 11

∴ m²-121 Seems to be in identity a²-b² = (a + b)(a-b)

Where a = m and b = 11;

m² – 121 = (m + 11)(m-11)

Hence the factors of m² – 121 are (m + 11) and (m-11)