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(2+√7)² + (2-√7)² - 4(2+√7)(2-√7)
(2+√7)(2+√7) + (2-√7)(2-√7) - 4(2+√7)(2-√7)
(4+ 2√7 + 2√7 + √49) + (4 - 2√7 - 2√7 + √49) - 4(4 - 2√7 + 2√7 - √49)
(4 + 4√7 + 7) + (4 - 4√7 + 7) - 4(4 - 7)
4 + 4√7 + 7 + 4 - 4√7 + 7 - 16 + 28
4 + 7 + 4 + 7 - 16 + 28 + 4√7 - 4√7
11 + 11 + 12
22 + 12
34
Jadi jawabannya adalah D.34