Question

(radical din 3+ radical din 5 ) * (3- radical din 15)
Am nevoie urgent !MULTUMESC! :*

Answer 1

(√3+√5)(3-√15)=(√3+√5)√3(√3-√5)=√3(3-5)=-2√3

am folosit formula (a+b)(a-b)= a²-b²

unde a = (√3+√5) si b= (√3-√5)