Methods to find quadruple -21

Finding the quadruple of -21 involves understanding that quadrupling means taking four times the original number. If you start with the value -21, you multiply it by 4 to get a new number that is four times as large. In practice, you take the number -21 and multiply it by 4, which is written as (-21 * 4). This calculation yields -84, the quadruple of -21. This method works for any number and is a basic operation used frequently in mathematics to scale values by a factor of four.