Factories the following

49x² –

In the given expression 49x² –

Both terms are perfect square

⇒ 49x² = 7x × 7x

⇒ ()² =

49x² – Seems to be in identity a²-b² = (a + b)(a-b)

Where a = 7x and b = ;

∴ (7x)² –()² = ( 7x – ) (7x + )

Hence the factors of 49x² – are ( 7x – ) and (7x + )