Final answer:
To evaluate the expression 20² + 6(9 + 3), we simplify the parts within the parentheses first, then perform the multiplication, and finally, square the number 20 before adding the results.
Step-by-step explanation:
To evaluate the expression 20² + 6(9 + 3), we need to follow the order of operations. First, we simplify the parentheses. 9 + 3 = 12. Next, we perform the multiplication within the parentheses: 6 * 12 = 72. Lastly, we square 20: 20² = 400. Now, we add the results together: 20² + 6(9 + 3) = 400 + 72 = 472.
Learn more about evaluating numerical expressions