(sq.13-sq6) (sq.13+sq.6)
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Apply (a+b)(a-b) = (a²-b²)
(√13-√6)(√13+√6)
=[(√13)² -(√6)²]
=[13-6]
=7
(√13-√6)(√13+√6)
=[(√13)² -(√6)²]
=[13-6]
=7
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