Finding the double of -9

To find the double of -9, you start by taking the given number represented by -9. Doubling means you want to find a number twice as big, so the natural operation to perform is multiplication by 2. This is why the calculation involves multiplying -9 by 2. The expression (-9 * 2) captures this operation mathematically. When you multiply -9 by 2, the product you get, denoted as -18, is exactly double the original number. For example, if -9 were 7, then -18 would be (7 * 2), which is 14. This logic applies universally to any real number represented by -9, making -18 the doubled value of -9.