Linear and quadratic approximation. a. Find the linear approximating polynomial for the following functions centered at the given point a.

Khaleesi Herbert

Khaleesi Herbert

Answered question

2021-09-19

Linear and quadratic approximation 
1. Find the linear approximating polynomial for the following functions centered at the given point a. 
2. Find the quadratic approximating polynomial for the following functions centered at a. 
3. Use the polynomials obtained in parts (a) and (b) to approximate the given quantity. 
f(x)=x13,a=8 approximiate 7.513

Answer & Explanation

Margot Mill

Margot Mill

Skilled2021-09-20Added 106 answers

Given:
f(x)=x13,a=8
1) The polynomial that approximates the functions linearly is given by
p1(x)=f(a)+f(a)(xa)
p1(x)=813+13823(xa)
p1(x)=2+12(xa)
2) The polynomial that approximates the function quadratically is as follows:
p2(x)=f(a)+12f (a)(x8)2
p2(x)=2+112(x8)+12×29×853(x8)2
p2(x)=2+112(x8)1288(x8)2
3) The polynomials discovered in parts (a) and (b) to roughly the given quantity
p1(x)=2+112(x8)
Substitute the value of x=7.5
p1(7.5)=2+112(7.58)
p1(7.5)=1.9583
p2(x)=2+112(x8)1288(x8)2
Substitute the value of x=7.5
p2(7.5)=2+112(7.58)1288(7.58)2
p2(7.5)=1.95747

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