Question

(2√3+5)(5-2√3)+(4-√5)²+8√5

Answer 1

$5^{2}-(2sqrt{3})^{2}$$+4^{2}-2cdot4sqrt{5}+(sqrt{5})^{2}$$+8sqrt{5}$$=25-12+16-8sqrt{5}+5+8sqrt{5}=34$