When you use your calculator to find the square root of a number that is not a perfect square, the answer that you see is not the exact square root. When we use the radical sign to take the square roo...When you use your calculator to find the square root of a number that is not a perfect square, the answer that you see is not the exact square root. When we use the radical sign to take the square root of a variable expression, we should specify that x≥0x≥0 to make sure we get the principal square root. When we use the radical sign to take the square root of a variable expression, we should specify that x≥0 to make sure we get the principal square root.
