[tex] (3\sqrt{5} - \sqrt{10} ) {}^{2} [/tex]= Tolong y Kak

(3√5 - √10)²
= (3√5 - √10) (3√5 - √10)
= 9√25 - 3√50 - 3√50 + √100
= 9(5) - 6√50 + 10
= 45 - 6√25√2 + 10
= 45 - 6(5)√2 + 10
= 45 - 30√2 + 10
= 55 - 30√2
= 5 (11 - 6√2)

(3√5 - √10)²
3²√5² - √10²
9√25 - √100
9.5 - √25.4
45 - 5√4
40√4


semoga benar