Answer:
x = 12
Step-by-step explanation:
To find x, take the square root of both sides, canceling out the square of x and turning the expression to x = 12, because the square root of 144 is 12. To check, square 12 or multiply 12 by itself, taking you back to 144.
The solution is rational because it can be made by dividing two integers, 144 and 12
