( 2 + akar 3 ) ( 2 - akar 3 )

(2 + √3)(2 - √3)
= (2)(2) + (2)(-√3) + (√3)(2) + (√3)(-√3)
= 4 - 2√3 + 2√3 - 3
= 4 - 3
= 1

(2 + akar3) (2 - akar3)
= 4 + 2akar3 - 2akar3 - 3
= 4 - 3
= 1