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(a-b)²=a²-2ab+b²
1.
(√5+√3)² =5+2√5*√3+3 =8+2√15
2.
(2√7+4)² =4*7+2*2√7*4+16 = 44+16√7
3.
(√3-2)² =3-4√3+4 =7-4√3
4.
(√11-√6)² =11-2√11*√6+6 =17-2√66
(a+b)² = a² + 2ab + b²
(a-b)² = a² - 2ab + b²