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= (a+b)² - 2ab - 4ab
= (a + b)² - 6ab
Maka :
= (2 + √7 + 2 - √7) ² - 6(2 + √7)(2 - √7)
= (4)² - 6{(2)² - (√7)²}
= 16 - 6(4 - 7)
= 16 - 6(-3)
= 16 + 18
= 34