Respuesta :

ChoiSungHyun

Step-by-step explanation:

Using FOIL,

(2 + √3)(1 + √3)

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

= 2 + 2√3 + √3 + 3

= 5 + 3√3.