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Chapter 1: Q. 87 (page 38)

In the following exercise, simplify each expressions.

(a) 27--18

(b)27+18

Short Answer

Expert verified

Part (a) The simplified value is 45.

Part (b) The simplified value is 45.

Step by step solution

01

Part (a) 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

Part (a) Step 2. Calculation.

Add the opposite of the opposite of 18 with 27.

27--18=27+18=45

03

Part (b) Step 1. Calculation. 

Add the numbers 27 and 18.

27+18=45

04

Part (b) Step 2. Conclusion. 

The simplified value of27+18is 45.

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