Answer :
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 + 
)
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