Identify Equation: Identify the equation and the operation needed to isolate x. We have x=20. To solve for x, we need to square both sides of the equation to eliminate the square root.
Perform Operation: Perform the operation to solve for x. Square both sides of the equation: (x)2=202.
Calculate Squares: Calculate the squares on both sides of the equation. x=20×20.
Find Value: Complete the calculation to find the value of x. x=400.