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Chapter 1: Q. 31. (page 21)

In the following exercises, evaluate the following expressions.

Whenx=2

(a) x6

(b) 4x

(c)2x2+3x-7

Short Answer

Expert verified

Part (a). The obtained value is 64.

Part (b). The obtained value is 16.

Part (c). The obtained value is 7.

Step by step solution

01

Part (a). Step 1. Given Information.

The given expression isx6and the given value isx=2.

02

Part (a). Step 2. Substitute the given value into the expression. 

Substitute 2 for x into the given expression and simplify.

26=64

03

Part (b). Step 1. Given Information

The given expression is4x and the given value is x=2.

04

Part (b). Step 2. Substitute the given value into the expression. 

Substitute 2 for x into the given expression and simplify.

42=16

05

Part (c). Step 1. Given Information

The given expression is 2x2+3x-7and the given value is x=2.

06

Part (c). Step 2. Substitute the given value into the expression. 

Substitute 2 for x into the given expression and simplify by applying the order of the operation.

222+32-7=24+6-7=8+6-7=14-7=7

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