a,\(x^2+10x+25=0\)

\(\Leftrightarrow\left(x+5\right)^2=0\)

\(\Leftrightarrow x+5=0\)

\(\Leftrightarrow x=-5\)

d,\(x^2-49=0\)

\(\Leftrightarrow x^2-7^2=0\)

\(\Leftrightarrow\left(x+7\right)\left(x-7\right)=0\)

TH1: x+7=0 =>x=-7

TH2: x-7=0=>x=7

Tính

a,\(\sqrt{2-\sqrt{3}}-\sqrt{2+\sqrt{3}}\)

b,\(\sqrt{3+\sqrt{5}}+\sqrt{7-3\sqrt{5}}-\sqrt{2}\)

c,\(\left(\sqrt{5-2}\right)\left(\sqrt{5+2}\right)\)

Tính

a,\(\sqrt{2-\sqrt{3}}-\sqrt{2+\sqrt{3}}\)

b,\(\sqrt{3+\sqrt{5}}+\sqrt{7-3\sqrt{5}}-\sqrt{2}\)

Tính

A= \(\sqrt{\left(1-\sqrt{3}\right)^2}-\sqrt{\left(\sqrt{3}+2\right)^2}\)

B=\(\sqrt{\left(2-\sqrt{3}\right)^2}+\sqrt{4-2\sqrt{3}}\)

C=\(\sqrt{15-6\sqrt{6}}+\sqrt{33-12\sqrt{6}}\)

Tính

a,8+2\(\sqrt{15}\)

b,12+2\(\sqrt{35}\)

c,8+\(\sqrt{60}\)