NCERT Example 15 - Number Systems
Question: Simplify: (i) (sqrt(5) + sqrt(7))(2 + sqrt(5)) (ii) (sqrt(5) + sqrt(2))(sqrt(5) - sqrt(2)) (iii) (sqrt(3) + sqrt(7))² (iv) (sqrt(11) - sqrt(7))(sqrt(11) + sqrt(7))
Answer: (i) 2sqrt(5) + 5 + 2sqrt(7) + sqrt(35) (ii) 3 (iii) 10 + 2sqrt(21) (iv) 4.
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