- A= 7
- B= 7
- C= 8
- D2 = 1
View written solutionFree
Correct answer: B
We interpret the chained equality as the system
We need the value(s) of for which the system has no solution.
1. Form the coefficient matrix
The coefficient matrix is
and the augmented matrix is
For a system to have no solution, we need:
- so that the system is singular, and
- the augmented system must be inconsistent.
2. Compute
Expand along the first row:
This would never be zero, which suggests a sign issue in expansion. So let us compute carefully again.
Using direct expansion:
Again impossible to vanish. This means the intended equations are more likely the standard interpretation from the printed question:
Now reduce using the first two equations.
3. Solve first two equations
Add the first two equations:
Substitute into the first equation:
So
4. Use the third equation
Third equation:
With and ,
Since
for every real , there is always a unique value of . Thus the system can never be inconsistent.
So there must be a typo in the question/options, or the intended third equation likely has coefficient (not ) and/or different constants.
5. Check the option matching the usual intended form
A very common version is
Then using :
For no solution, we need coefficient of to be zero but RHS nonzero:
and then RHS , so no solution at . But is not among the options.
Hence, as written, none of the options is correct.
6. Conclusion
The given system, with in the third equation, is always consistent and has a unique solution for every real . Therefore it never has no solution.
So the stored answer does not agree with the mathematics of the written question.
More from Matrices and Determinants
- If the system of linear equations , , where , , R has infinitely many solutions then the value of | 9 + 3 + 5 | is equal to …2022 · Numerical
- Let where . Then, the number of elements in the set { n } {1, 2, ......, 100} : An = A } is .2022 · Numerical
- Let A and B be two non-zero real matrices such that AB is a zero matrix. Then2022 · MCQ
- Let p and p + 2 be prime numbers and let …2022 · Numerical
- Which of the following matrices can NOT be obtained from the matrix by a single elementary row operation ?2022 · MCQ
- If the system of equations has infinitely many solutions, then is equal to2022 · MCQ
- Let and . For , if , then …2022 · Numerical
- If the system of linear equations 2x + y z = 7 x 3y + 2z = 1 x + 4y + z = k, where , k R has infinitely many solutions, then + k is equal to:2022 · MCQ