Consider the following matrix
A = 
If the eigenvalues of A are 4 and 8, then
(A) x=4, y=10
(B) x=5, y=8
(C) x=-3, y=9
(D) x= -4, y=10
Answer: (D)
Explanation: ![A = \begin{bmatrix} 2 & 3 \\ x & 4 \\ \end{bmatrix} \newline \newline [A - \lambda i]=0 \newline \newline \begin{bmatrix} 2-\lambda & 3 \\ x & y-\lambda \\ \end{bmatrix} = 0 \newline \newline (2-\lambda)(y-\lambda) - 3x =0 \newline given \hspace{0.2cm} eigen\hspace{0.2cm} values: \lambda=4,8 \newline if \hspace{0.2cm} we \hspace{0.2cm} use \hspace{0.2cm} \lambda=4\hspace{0.2cm} then \hspace{0.2cm} equation, \hspace{0.2cm} -2(y-4)-3x=0 . . . . ...(i) \newline if \hspace{0.2cm} we \hspace{0.2cm} use \hspace{0.2cm} \lambda=8\hspace{0.2cm} then \hspace{0.2cm} equation, \hspace{0.2cm} -6(y-8)-3x=0 . . . . ...(ii) \newline Solving \hspace{0.2cm} equations \hspace{0.2cm} (i) & (ii), we \hspace{0.2cm} get, x=-4,y=10](https://www.geeksforgeeks.org/wp-content/ql-cache/quicklatex.com-fa0ed4eae40d57b8c049d03a991300f6_l3.png "Rendered by QuickLaTeX.com")
Quiz of this Question
Recommended Posts:
- GATE | GATE CS 2010 | Question 4
- GATE | GATE CS 2010 | Question 5
- GATE | GATE CS 2010 | Question 6
- GATE | GATE CS 2010 | Question 65
- GATE | GATE CS 2010 | Question 8
- GATE | GATE CS 2010 | Question 65
- GATE | GATE CS 2010 | Question 10
- GATE | GATE CS 2010 | Question 11
- GATE | GATE CS 2010 | Question 65
- GATE | GATE CS 2010 | Question 13
- GATE | GATE CS 2010 | Question 14
- GATE | GATE CS 2010 | Question 15
- GATE | GATE CS 2010 | Question 16
- GATE | GATE CS 2010 | Question 65
- GATE | GATE CS 2010 | Question 3
- GATE | GATE CS 2010 | Question 37
- GATE | GATE CS 2010 | Question 58
- GATE | GATE CS 2010 | Question 57
- GATE | GATE CS 2010 | Question 56
- GATE | GATE CS 2010 | Question 55
