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# SCIN_2326_Dossier_COVID_2020SP_GPerreault MATH 1057EL XXXXXXXXXXSPRING 2020 ASSIGNMENT FILE Page 1 ASSIGNMENT 3 Total Marks: 60 (To count 20% of the Final Grade) Material covered in this Assignment:...

SCIN_2326_Dossier_COVID_2020SP_GPe
eault
MATH 1057EL XXXXXXXXXXSPRING 2020 ASSIGNMENT FILE Page 1
ASSIGNMENT 3

Total Marks: 60 (To count 20% of the Final Grade)

Material covered in this Assignment: Modules 6 and 7

Due Date: Thursday, July 9

IMPORTANT!

“Messages from your Course Instructor” for details on how to

should be given in exact values (no decimals) whenever
appropriate.

Marks will be deducted for not following these instructions.

MATH 1057EL XXXXXXXXXXSPRING 2020 ASSIGNMENT FILE Page 2
1. Which of the following transformations are linear? [9 marks]
a. defined by .

. defined by .

QUESTION #1 CONTINUED ON THE NEXT PAGE
T :R2 → R2 T x
y
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3x − 5y
y
!
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#
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&
T :M22 →M22 T
w x
y z
!
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##
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&&=
w+ x 1
0 y− z
!
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&&
MATH 1057EL XXXXXXXXXXSPRING 2020 ASSIGNMENT FILE Page 3
QUESTION #1 CONTINUED

c. defined by .

2. Let T: be the linear transformation defined by

Which, if any, of the following matrices are in ker(T)? Explain your choice(s).
i. ii. iii. iv.
[2 marks]

T :R→ R T (x) = (−3)x
M 22 → P1
T a
c d

⎜⎜

⎟⎟= a+ d( ) x +
−4 0
6 4

⎜⎜

⎟⎟
0 −2
2 0

⎜⎜

⎟⎟
0 0
0 0

⎜⎜

⎟⎟
3 0
0 3

⎜⎜

⎟⎟
MATH 1057EL XXXXXXXXXXSPRING 2020 ASSIGNMENT FILE Page 4
3. Define T: by T(X) = AX where A = . [5 marks]
a. Find the kernel of T.

. Give TWO examples of vectors in the kernel.

c. Is T one-to-one? Explain.

R3→ R3
1 1 −1
3 1 −1
−1 −2 2
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'
'
'
MATH 1057EL XXXXXXXXXXSPRING 2020 ASSIGNMENT FILE Page 5
4. Define T: by T(x, y) = det Find the nullity of the
transformation T and then verify the Rank/Nullity Theorem (Theorem #3).
[3 marks]

5. For what value(s) of k, if any, is the transformation T: defined by
T(x, y) = 2x – k linear? [3 marks]

R2 → R x −4
y −4
"
#
\$\$
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&
''
R2 → R
MATH 1057EL XXXXXXXXXXSPRING 2020 ASSIGNMENT FILE Page 6
6. Let T: be a linear transformation defined by
T(x, y, z) = (-z, y + z, -y, 2z – x).
a. Find the standard matrix for T and use it to find the image of (2, 3, -1).

b. Is T an invertible transformation? Explain. [4 marks]

7. Let T be a linear transformation on R2 defined as follows on the standard
asis of R2. T(1, 0) = (6, -1) and T(0, 1) = (-7, 3). Without finding the
standard matrix, calculate T(4, 2). [2 marks]

R3→ R4
MATH 1057EL XXXXXXXXXXSPRING 2020 ASSIGNMENT FILE Page 7
8. Let B = { (1, 1), (3, 5) } and C = { (1, 2), (-1, -1) } be two ordered basis of R2.
a. Find the transition matrix from basis B to basis C.

. Find the transition matrix from basis C to basis B. [5 marks]

c. Show that the transition matrices are inverses of each other.

MATH 1057EL XXXXXXXXXXSPRING 2020 ASSIGNMENT FILE Page 8
9. Calculate the following quantities: [8 marks]
a. Given that z = 2 – i, calculate .

.

c. 2i15 – i36

d.

z2 − z +3
1+ i( ) 3− i( )
1− i( ) −2−3i( )
−1+ 4i
MATH 1057EL XXXXXXXXXXSPRING 2020 ASSIGNMENT FILE Page 9
10. If z is an a
itrary complex number, prove that .
[3 marks]

11. Write the complex number in polar and rectangular form. [2 marks]

12. Write the complex number in polar and exponential form. [3 marks]

Im(z) = − i
2
z − z( )
3ei5π 4
1− 3i
MATH 1057EL XXXXXXXXXXSPRING 2020 ASSIGNMENT FILE Page 10
13. Use the exponential form of a complex number to write in the form
a + ib. [3 marks]

14. Let and . Find AB. [4 marks]

−1+ i( )10
A= 2i 1+ i
−i 2−3i

⎜⎜

⎟⎟ B =
4i −1− i
2+ i 2i

⎜⎜

⎟⎟
MATH 1057EL XXXXXXXXXXSPRING 2020 ASSIGNMENT FILE Page 11
15. Find the eigenvalues of [4 marks]

A= 1 −i
i 1

⎜⎜

⎟⎟
Answered Same Day Jun 18, 2021

## Solution

Rajeswari answered on Jun 19 2021
60766 assignment
Qno.1
Consider
Since both conditions are satisfied T is linear transformation.
Since I and II are equal we get sum is preserved by transformation
Next scalar product
But
The two are not equal. Hence not linear.
c)
T(x+y) =
T(x)+T(y) =
The two are not equal hence not linear.
Qno.2
To find kernel of T is equivalent to put Ax =0 where A is the transformation matrix.
=0
i.e. (a+d)x+b =0
Equate x coefficient and constant term to 0 to get
Since c is not here, c can be artbitrary. So we have a =-d and b=0
Out of the given matrices only
Satisfied a=-d and b=0. C is artbitrary
So option a is answe
3)a) To find kernel of T we use Ax=0
i.e. We have det A =0
This means for any x the value Ax=0
So kernel contains of all real 3x3 matrices
) Examples are any 2 3x3 matrices as
and
c) T is not one to one as all matrices are mapped onto 0 matrix.
Qno.4
T=
This would be 0 if x=y. i.e. kernel has all cases where x =y
When x =y, T matrix is , two identical rows. Hence rank =1
Nullity (T) =1
Rank of T = dim (image T) = 1 since mapped on to R
Rank of T + nullity of T = 1+1 =2 = dimension of domain which is R square hence 2
As per rank nullity theorem...
SOLUTION.PDF