Question

Помогите ребята с примерами,даю 20 баллов)
1) (√50+4√2)×√2
2) (√5-1)²-(2×√3+1)²

Answer 1

1) $( sqrt{50}+4sqrt{2})*sqrt{2}=sqrt{100}+4sqrt{4}=10+4*2=10+8=18$

2) $( sqrt{5}-1)^{2}-(2sqrt{3}+1)^{2}=(sqrt{5})^{2}-2sqrt{5}*1+1^{2}-((2sqrt{3})^{2}+2*2sqrt{3}*1+1^{2})=5-2sqrt{5}+1-(12+4sqrt{3}+1)=5-2sqrt{5}+1-12-4sqrt{3}-1=-7-6sqrt{3}$