Find the roots of the following quadratic equations by factorisation method.
Given, 
⇒ 441x2 - 42x + 1 = 0
By splitting the middle term,
⇒ 441x2 - 21x - 21x + 1 = 0
Taking common in the expression,
⇒ 21x (21x - 1) – 1 (21x - 1) = 0
⇒ (21x - 1) (21 x - 1) = 0
∴ 21x – 1 = 0 and ∴ 21x – 1 = 0
∴ 
and ∴ 
2