Question

a) (radical din 5 + radical din 3)²
b) (radical din 5 - radical din 3)²
c) media geometrica a , b

Answer 1

a) = 5+2*rad(15)+3=8+2rad(15)=2(4+rad(15))

b) = 5-2rad(15)+3=8-2rad(15)=2(4-rad(15))

c) =radical(a*b)

formula generala:

-binom la patrat

(a+b)²=a²+2*a*b+b²

(a-b)²=a²-2*a*b+b²