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(7 + √2 + 7 - √2)(7 + √2 + 7 - √2)
49 + 2 + 49 - 2 + 49 - 2 + 49 + 2
51 + 47 + 47 + 51
98 + 98
196
b = 7-√2
a+b = 7 + √2 + 7 - √2
= 7 + 7 +√2 - √2
= 14 + 0 = 14
14² = 616