(3-√2)(3+√2) =bagaimana caranya

Seinget saya dikali pelangi .

Jadi :

(3-√2)(3+√2)= 9+3√2-3√2-2
=9-2 =7

Maaf kalo kurang memuaskan

(3-√2)(3+√2) dikalikan satu-satu
= (3 x 3) + (3 x √2) + (-√2 x 3) + (-√2 x √2)
= 9 + 3√2 -3√2 -2
= 9 - 2
= 7