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Chapter 1: Q 120. (page 39)

In the following exercises, evaluate each expression.

x+-21when

(a) x=-27

(b)x=44

Short Answer

Expert verified

(a)-48

(b) 23

Step by step solution

01

Part (a). Step 1. Given Information:

The given expression is x+-21and the value of the variable is x=-27.

02

Part (a). Step 2. Substitute the values:

Substitute -27for xinto the given expression x+-21.

-27+-21

03

Part (a). Step 3. Perform Addition:

Add -27and -21in the obtained expression.

-27+-21=-48

04

Part (a). Step 4. Conclusion:

The value is-48.

05

Part (b). Step 1. Given Information:

The given expression isx+-21and the value of the variable isx=44.

06

Part (b). Step 2. Substitute the values:

Substitute 44 for xinto the given expression x+-21.

44+-21

07

Part (b). Step 3. Perform Subtraction:

Rewrite the obtained expression using the subtraction property a+-b=a-b.

44+-21=44-21

Subtract 21 from 44.

44-21=23

08

Part (b). Step 4. Conclusion:

The value is 23.

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