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Calculate the surd of the following (1). (7 - 2) (√7 + 2 ) (2)....

Calculate the surd of the following
(1). (7 - 2) (√7 + 2 )
(2). (4√2 - 3) (4√2 + 3)
(3). (1 - 2√5) (1+2√5)
(4). (√6 - √2) (√6 + √2)
(5). (3√5 -√2) (3√5 +52)
(6) (256 -3√7) (256 +3√7)?

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