Question

questions will be in the comment section

Answer 1

Just square both sides of the equation.

Answer 2

first question : \[\sqrt{x-1-4=3 } second question \sqrt{x-7-4=0}\]

Answer 3

\[\sqrt{x-1-4}=3\]\[x-1-4=3^2\]\[x-5=9\]

Answer 4

Do you understand?