Which among the below option can be a square root of ?

$(x^2 - 14x + 49)(x^2 + 6x + 9)$

(x - 7)(x + 3)

( a + b )² = a² + b² + 2ab

Given, $(x^2 - 14x + 49)(x^2 + 6x + 9)$

= $(x^2 - 14x + 49)$ = (x - 7)²

= $(x^2 + 6x + 9)$ = (x + 3)²

So,

= \(\sqrt {(x - 7)^2 (x + 3)^2}\)

$(x^2 - 14x + 49)(x^2 + 6x + 9)$ can be the square root of = (x - 7)(x + 3)