can only one slove this
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vii)(√11+√7) (√11-√7)
use (a+b) (a-b) =a•a - b•b
√11×√11 -√7×√7
11-7
4
use (a+b) (a-b) =a•a - b•b
√11×√11 -√7×√7
11-7
4
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