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Question 4: (12 points)

Format:

• Remember: Möbius does not check your method, and matrix

computations are fiddly. Make sure to check your answers carefully

before submitting.

. If your answer is a vector, enter it as a column vector using the

vector/matrix palette tool.

a. Showhide

Find d such that det A-0, where

A=0d -1

30 10

d=

b. Showhide

Now, and for the remainder of this question, instead set d = 12, so

4 3 13 Y

A=0 12

30 10,

Calculate the matrix of cofactors for the matrix A.

matrix of cofactors

c. Showhide

Use the information above to find the inverse matrix A-¹,

employing the method of cofactors. (This part still uses that d - 12

)

A-1 =

d. Showhide

Use your answer from the previous part to solve the matrix equation

4 3 131

90-0

0 12

30

10

need full solution with final answer on the box

POF

Fig: 1