Evaluate each expression. See Example 3. 10 – 9 – (–8) Reference Example 3. Evalu...

Evaluate each expression. See Example 3.

10 – 9 – (–8)

Reference Example 3.

Evaluate: –1 – (–2) – 10

Strategy This expression involves two subtractions. We will write each subtraction as addition of the opposite and then evaluate the expression using the order of operations rule.

Why It is easy to make an error when subtracting signed numbers. We will probably be more accurate if we write each subtraction as addition of the opposite. Solution We apply the rule for subtraction twice and then perform the additions, working from left to right. (We could also add the positives and the negatives separately, and then add those results.)