bantu dong pakai caranya

[tex] = (3 \sqrt{5} - 7 \sqrt{6} )^{2} \\ = (3 \sqrt{5} - 7 \sqrt{6} ) \times (3 \sqrt{5} - 7 \sqrt{6} ) \\ = 45 - 21 \sqrt{30} - 21 \sqrt{30} + 294 \\ = 339 - 42 \sqrt{30} [/tex]

Semoga membantu

(3√5 - 7√6)²
= (3√5 - 7√6) (3√5 - 7√6)
= 9√25 - 21√30 - 21√30 + 49√36
= 9(5) - 21√30 - 21√30 + 49(6)
= 45 - 42√30 + 294
= 339 - 42√30