bracket root 7 + root 2 bracket bracket root 7 + root 2 bracket
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(√7 + √2)(√7 + √2)
= (√7 + √2)^2
= (√7)^2 + 2(√7)(√2) + (√2)^2 [(a+b)^2 = a^2 + 2ab + b^2]
= 7 + 2√14 + 2
= 9 + 2√14
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