(a + b)² = a² + 2ab + b²
a² - b² = (a - b)(a + b)
(√(4 - √7) + √(4 + √7))² = (4 - √7) + 2 √(4 - √7) √(4 + √7) + 4 + √7 = 8 + 2√(16 - 7) = 8 + 2*3 = 14
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(a + b)² = a² + 2ab + b²
a² - b² = (a - b)(a + b)
(√(4 - √7) + √(4 + √7))² = (4 - √7) + 2 √(4 - √7) √(4 + √7) + 4 + √7 = 8 + 2√(16 - 7) = 8 + 2*3 = 14