No 11 mohon bantuannya

(a² - b²) + a² + b²
= (a - b)² + 2ab + (a + b)² - 2ab
= (√D/a)² + (-b/a)²
= (√{6²-4(3)(2)}/3)² + (-6/3)²
= (√12 / 3)² + 36/9
= 12/9 + 36/9
= 48/9
= 5 (3/9)
= 5(1/3)