sederhanakan bentuk akar (2 akar 2+akar 3) (2 akar 2- akar3)

a² - b² = (a + b)(a - b)

(2√2 + √3)(2√2 - √3) = 4×2 - 3 = 8 - 3 = 5

(x+y)(x-y) = x²-y²

maka

(2√2+√3)(2√2-√3) = (2√2)² - (√3)²
                             = 8 - 3 = 5