Use a calculator to find the square root of 4, 9, and 16. Taking the square root means you are multiplying two of the same numbers together to give you that number. What two of the same numbers multiply together to give you 4? 9? 16? Now on your calculator, take the square root of -4. What does the calculator give you? Why do you think this is ________. Can you find two numbers that are the same and multiply to make -4?