Let f ( x ) = x 5 − 1 , g ( x ) = x 3 − 4 x 2 + 8 , and h ( x ) = 2 x 4 + x 3 − x 2 + 3 x + 3 . Find the following function values by using synthetic division. Check by using substitution. f (1)
Let f ( x ) = x 5 − 1 , g ( x ) = x 3 − 4 x 2 + 8 , and h ( x ) = 2 x 4 + x 3 − x 2 + 3 x + 3 . Find the following function values by using synthetic division. Check by using substitution. f (1)
Solution Summary: The author explains how to calculate the value of f (x) = x 5 1 at a point.
Let
f
(
x
)
=
x
5
−
1
,
g
(
x
)
=
x
3
−
4
x
2
+
8
, and
h
(
x
)
=
2
x
4
+
x
3
−
x
2
+
3
x
+
3
. Find the following function values by using synthetic division. Check by using substitution.
Let
2
A =
4
3
-4
0
1
(a) Show that v =
eigenvalue.
()
is an eigenvector of A and find the corresponding
(b) Find the characteristic polynomial of A and factorise it. Hint: the answer to (a)
may be useful.
(c) Determine all eigenvalues of A and find bases for the corresponding eigenspaces.
(d) Find an invertible matrix P and a diagonal matrix D such that P-¹AP = D.
(c) Let
6
0 0
A =
-10 4 8
5 1 2
(i) Find the characteristic polynomial of A and factorise it.
(ii) Determine all eigenvalues of A and find bases for the corresponding
eigenspaces.
(iii) Is A diagonalisable? Give reasons for your answer.
most 2, and let
Let P2 denote the vector space of polynomials of degree at
D: P2➡ P2
be the transformation that sends a polynomial p(t) = at² + bt+c in P2 to its derivative
p'(t)
2at+b, that is,
D(p) = p'.
(a) Prove that D is a linear transformation.
(b) Find a basis for the kernel ker(D) of the linear transformation D and compute its
nullity.
(c) Find a basis for the image im(D) of the linear transformation D and compute its
rank.
(d) Verify that the Rank-Nullity Theorem holds for the linear transformation D.
(e) Find the matrix representation of D in the standard basis (1,t, t2) of P2.
Chapter 3 Solutions
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