Question

(√2-3√5)²+(√2+3√5)² ???

Answer 1

(√2 - 3√5)²+(√2 + 3√5)²
(2-2√90+45)+(2+√90+45)
2-2√90+45+2+2√90+45
Сокращаем... .
2+2+45+45=94.
Вроде так)

Answer 2

(√2-3√5)²+(√2+3√5)²=(√2)²-2*3*√2*√5+(3√5)²+(√2)²+2*3*√2*√5+(3√5)²=2-6√10+9*5+2+6√10+9*5=2*2+2*45=94