Final answer:
To calculate -5 × (-3 + 12 - 9), first simplify the expression within the parentheses, then multiply the result by -5.
Step-by-step explanation:
To calculate the expression -5 × (-3 + 12 - 9), we need to follow the order of operations, which is also known as PEMDAS. PEMDAS stands for Parentheses, Exponents, Multiplication and Division (from left to right), and Addition and Subtraction (from left to right). In this case, we start by simplifying the expression within the parentheses: -3 + 12 - 9 = 0. Then, we multiply -5 by 0, which results in 0 as well.
Learn more about Multiplication of negative numbers