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1. If x = 3 + 1 and y = 3 - 1 , then the value of (x2 + y2) is: 3 - 1 3 + 1





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  • By: guest on 01 Jun 2017 05.48 pm
    x = (3 + 1) x (3 + 1) = (3 + 1)2 = 3 + 1 + 23 = 2 + 3 . (3 - 1) (3 + 1) (3 - 1) 2 y = (3 - 1) x (3 - 1) = (3 - 1)2 = 3 + 1 - 23 = 2 - 3 . (3 + 1) (3 - 1) (3 - 1) 2 x2 + y2 = (2 + 3 )2 + (2 - 3 )2    = 2(4 + 3)    = 14
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