Problem 2. In this problem, we will practice a bit with numerical integration. We take the following facts for granted: for any a

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Chapter2: Functions And Graphs
Section2.6: Proportion And Variation
Problem 24E: Solve each problem. w is directly proportional to z. If w=-6 when z=2, find w when z=-3.
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Problem 2. In this problem, we will practice a bit with numerical integration. We take
the following facts for granted: for any a <b, any f: [a, b] → R, and any n ≥ 1,
and
RIGHT(ƒ,n) – [*° f(x)dx ≤
2
1(b-a)²
n
Compute
SIMP(f,n) - [ f(x)dx ≤ max f(i)(x)\,
[ab]
max f'(x)|
z€[a,b]
(b-a)5
180n4
SIMP(f,n):
(S)
where RIGHT(f, n) is the right hand Riemann sum with n equal intervals and SIMP (f, n)
is the approximation of f f(x)dx using Simpson's rule with n equal intervals. Here f(iv)
is the fourth derivative of f.
(i) Suppose that f is a third degree polynomial f(x) = a3x³ + a₂x² + a₁ + ao. Argue
that, for any n, a, and b,
(L)
f(x)dr.
(ii) Show that the same is not true for RIGHT(f, n) by giving an example of a third degree
polynomial f, a natural number n, and endpoints a < b so that
RIGHT (f, n) + f(z)dr.
Hint: linear functions are third degree polynomials and n = 1 is a natural number...
(iii) For the remaining parts, use a = 0, b = 2, and
f(x)=
-4.
RIGHT(f, 4)
and
SIMP (f, 4).
You may do this by hand, by writing code, or by using an online calculator, but you
must document your computations (either via screenshots or by writing down your
work).
Transcribed Image Text:Problem 2. In this problem, we will practice a bit with numerical integration. We take the following facts for granted: for any a <b, any f: [a, b] → R, and any n ≥ 1, and RIGHT(ƒ,n) – [*° f(x)dx ≤ 2 1(b-a)² n Compute SIMP(f,n) - [ f(x)dx ≤ max f(i)(x)\, [ab] max f'(x)| z€[a,b] (b-a)5 180n4 SIMP(f,n): (S) where RIGHT(f, n) is the right hand Riemann sum with n equal intervals and SIMP (f, n) is the approximation of f f(x)dx using Simpson's rule with n equal intervals. Here f(iv) is the fourth derivative of f. (i) Suppose that f is a third degree polynomial f(x) = a3x³ + a₂x² + a₁ + ao. Argue that, for any n, a, and b, (L) f(x)dr. (ii) Show that the same is not true for RIGHT(f, n) by giving an example of a third degree polynomial f, a natural number n, and endpoints a < b so that RIGHT (f, n) + f(z)dr. Hint: linear functions are third degree polynomials and n = 1 is a natural number... (iii) For the remaining parts, use a = 0, b = 2, and f(x)= -4. RIGHT(f, 4) and SIMP (f, 4). You may do this by hand, by writing code, or by using an online calculator, but you must document your computations (either via screenshots or by writing down your work).
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