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Chapter 1: Q. 90 (page 38)

In the following exercise, simplify each expressions.

1-8-2-9

Short Answer

Expert verified

The simplified value is 0.

Step by step solution

01

Step 1. Concept Used.

According to subtraction property, the subtraction of a number is equal to the addition of its opposite. This can be expressed as follows.

a-b=a+-b

02

Step 2. Simplification inside parentheses.

Add the opposite of 8 with 1 inside the first parentheses and opposite of 9 with 2 in the second parentheses.

1-8-2-9=-7--7=-7--7

03

Step 3. Calculation.

Add the opposite of the opposite of 7 with the opposite of 7.

-7--7=-7+7=0

04

Step 4. Conclusion.

The simplified value of the given expression is 0.

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In the following exercises, use the divisibility tests to determine whether each number is divisible by 2, by 3, by 5, by 6, and by 10.

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