Question

When solving 4(2x+5) = 100, Roberto wrote 8x+20 = 100. Which number property did Roberto use?

Answer 1

The property that Roberto used is Distribution property.

Step-by-step explanation:

Take what's outside of the parenthesis and multiply it by everything inside of the parenthesis.

4 * 2x = 8x

4 * 5 = 20

So now the equation is: 8x + 20 = 100

Answer 2

This property is known as the distributive property.

When you have a variable inside or outside a pair of parentheses, you can multiply the number outside the parentheses to each term inside the parentheses, and the answer will still be the same.