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Chapter 8: Q. 11 (page 917)

In the following exercises, evaluate the rational expression for the given values.

a2-4a2+5a+4(a)a=0(b)a=1(c)a=-2

Short Answer

Expert verified

The required answers are

Part(a)-1Part(b)-310Part(c)0

Step by step solution

01

Part(a) Step 1. Given Information  

The given expression isa2-4a2+5a+4

02

Part (a) Step 2. Calculation    

Substitute 0 for a,

a2-4a2+5a+4=(0)2-4(0)2+5(0)+4=-44=-1

03

Part (b) Step 1. Calculation   

Substitute 1 for a,

a2-4a2+5a+4=(1)2-4(1)2+5(1)+4=1-41+5+4=-310

04

Part (c) Step 1. Calculation   

Substitute -2 for a,

a2-4a2+5a+4=(-2)2-4(-2)2+5(-2)+4=4-44-10+4=0

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