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91Ó°ÊÓ

For each limit in Exercises 55–64, use graphs and algebra to approximate the largest delta or smallest-magnitude N that corresponds to the given value of epsilon or M, according to the appropriate formal limit definition.

limx→-∞3x=0,ε=12,findsmallest-magnitudeN<0

Short Answer

Expert verified

The required value ofN≈-0.63093

Step by step solution

01

Step 1. Given Information   

The given function isf(x)=3x

02

Step 2. Explanation    

From the given function, we have, c=-∞,L=0

The limit expression can be written as a formal statement as below,

For all epsilon positive, there is some N negative such that ifx∈(-∞,N)

Thenlocalid="1648048757658" 3x∈(0-ε,0+ε)

Now the smallest value of N is given by,

localid="1648048775838" 3x=0+12ln3x=ln(12)xln3=ln(12)x=ln(0.5)ln3x≈-0.693151.0986x≈-0.63093

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