The square root of is :

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Given expression

[∵ a² − b² = (a + b)(a − b)]

=		3	1		²	+		4	1		²	=		13		²	+		13		²
			4						3					4					3

=	169	+	169	= 169		1	+	1
	16		9			16		9

= 169		9 + 16		=	169 × 25
		144			144

∴ Required answer

=	√	169 × 25	=	13 × 25	=	65	= 5	5
		144		12		12		12