Find all values of such that sqrt4 x^2 + sqrt x^2=6.

there are more than 1 answers, and 2 and 6 i have done, dont know the rest

sqrt4 x^2 + sqrt x^2=6

You have not used brackets, is this the question?

\(\sqrt{4 x^2} + \sqrt {x^2}=6\)

\(\sqrt{x^2}=|x| \\SO\\ 2|x|+|x|=6\\ 3*|x|=6\\ |x|=2\\ x=\pm2\)

I have assumed that x is a real number.