Question

Factorisation of 1 - 49a² is​

Answer 1

$1 - 49 {a}^{2} \\ = > {(1})^{2} - {(7a)}^{2} \\ = > (1 + 7a)(1 - 7a)$

Answer 2

1²-49a²

= a²- b² = (a+b ) ( a- b)

so

(1+7a) (1-7a)