f(x)=√x
f(x+6)= √ (x+6)= 1/(3-√5)-1/(3+√5)*√80+6 = √ 1/ (3-√5)- √80/ (3+√5)+6= √(3+√5) - √80* (3-√5)+24/4= √3+ √5-3* √80+44/4= √3-11 √5+44/4
f(x)=√x
f(x+6)= √ (x+6)= 1/(3-√5)-1/(3+√5)*√80+6 = √ 1/ (3-√5)- √80/ (3+√5)+6= √(3+√5) - √80* (3-√5)+24/4= √3+ √5-3* √80+44/4= √3-11 √5+44/4