Question

\(\sqrt{a^2+6a+9}\) tách chi tiết

Answer 1

\(\sqrt{a^2+6a+9}=\sqrt{\left(a+3\right)^2}=\left|a+3\right|=a+3\)

Answer 2

\(\sqrt{a^2+6a+9}=\sqrt{a^2+2.a.3+3^2}=\sqrt{\left(a+3\right)^2}=\left|a+3\right|\)

Answer 3

ĐKXĐ: \(a\ge-3\)
\(\sqrt{a^2+6a+9}=\sqrt{a^2+3.2a+3^2}=\sqrt{\left(a+3\right)^2}=\left|a+3\right|=a+3\) 

 

Answer 4

\(\sqrt{a^2+6a+9}=\left|a+3\right|\)