Hasil dari 7(1+√2)(1-√2) per 3+√2

7(1 + √2)(1 - √2) / (3 + √2)
= 7(1² - (√2)²) × (3 - √2) / (3 + √2)(3 - √2)
= 7(1 - 2)(3 - √2) / (3² - (√2)²)
= -7(3 - √2) / (9 - 2)
= -(3 - √2)
= -3 + √2

semoga membantu yaa..