Question

\(\sqrt{x-3}-\sqrt{9x-27}+\sqrt{4x-12}=7\)

tìm x

Answer 1

x thuộc R

=))

Answer 2

\(\sqrt{x-3}-\sqrt{9x-27}+\sqrt{4x-12}=7\)

\(\sqrt{x-3}-3\sqrt{x-3}+2\sqrt{x-3}=7\)

\(0=7\)

Answer 3

bạn Mafia là đúng rồi nhưng hơi tắt mình sẽ giải cụ thể

\(\sqrt{x-3}-\sqrt{9x-27}+\sqrt{4x-12}=7\)

\(\sqrt{x-3}-\sqrt{9\left(x-3\right)}+\sqrt{4\left(x-3\right)=7}\)

\(\sqrt{x-3}-\sqrt{3^2\left(x-3\right)}+\sqrt{2^2\left(x-3\right)}=7\)

\(\sqrt{x-3}-3\sqrt{x-3}+2\sqrt{x-3}=7\)

\(\left(1-3+2\right)\sqrt{x-3}=7\)

\(0\sqrt{x-3}=7\)

\(\sqrt{x-3}=0\)

\(\Rightarrow x-3=0\)

\(\Rightarrow x=3\)

vậy \(x=3\)