Question

√(9x+67=x+5=)

Answer 1

do u mean \[\sqrt{9x+67} = x+5 \]

find x?

Answer 2

yes

Answer 3

now you need to square both sides so it will be
\[9x+67 = (x+5)^{2}\]
\[9x +67 = x ^{2} + 10x + 25\]
\[x ^{2} + x -42 = 0\]
I guess it is clear now :)
note that you need to get rid of square roots in most problems by squaring you can get rid of it