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(a-b)² = a² - 2ab + b²
A więc:
(6-2√6)²= 6² - 2*6*2√6 + (2√6)² = 36 - 24√6 + 24 = 60 - 24√6
(2√12-5√3)²= (2√12)² - 2*2√12*5√3 + (5√3)² = 48 - 20√36 - 75 = 48 - 120 + 75 = 3
a)(6-2√6)²=6²-2*6*2√6+(2√6)²=36-24√6+24=36√6
b)(2√12-5√3)²=(2√12)²-2*2√12*5√3+(5√3)²=48-20√36+75=48-120+75=3