(√ ​7 ​ ​​ −√ ​3 ​ ​​ ) ​2 ​​ .

Question

(√
​7
​
​​ −√
​3
​
​​ )
​2
​​ .

Answer 1

(√7 - √3)² = (√7)² - 2√7·√3 + (√3)² = 7 - 2√21 + 3 = 10 - 2√21.

Answer 2

(а-b)²=a²-2ab+b²
(√7-√3)²=(√7)²-2√7*√3+(√3)²=7+3-2√7*3=10-2√21=2(5-√21)→oтвет.