Question

Factorise.

49x² − 36

Answer 1

49x² − 36 

On writing it as follows:

= (7x)² − (6)²

Using the identity a² − b² = (a − b) (a + b)

= (7x − 6) (7x + 6)

= a² − b² 

= (a − b) (a + b)