Matrices & Determinants Questions (2045)

If $A = \begin{bmatrix} -2 & -1 & 1 \\ -1 & 7 & 4 \\ 1 & -x & -3 \end{bmatrix}$ be symmetric matrix then find the value of $x$.

$A = [a_{ij}]_{m \times n}$ is a square matrix, if

If the coordinates of the vertices of an equilateral triangle with sides of length a are (x₁, y₁), (x₂, y₂) and (x₃, y₃), then $$\begin{vmatrix} x_1 & y_1 & 1 \\ x_2 & y_2 & 1 \\ x_3 & y_3 & 1 \end{vmatrix}$$ is equal to

If $[1 \quad x \quad 2] \begin{bmatrix} 2 & 3 & 1 \\ 0 & 4 & 2 \\ 0 & 3 & 2 \end{bmatrix} \begin{bmatrix} x \\ 1 \\ -1 \end{bmatrix} = O$, then the value of $x$ is

The system of equations has a non-trivial solution if and only if $\begin{vmatrix} \sin 3\theta & -2 & 3 \\ \cos 2\theta & 8 & -7 \\ 2 & 14 & 11 \end{vmatrix} = 0$

If $A = \begin{bmatrix} 2 & 0 & 0 \\ 0 & 2 & 0 \\ 0 & 0 & 2 \end{bmatrix}$, then $A^5 =$

If $[1 \quad x \quad 2] \begin{bmatrix} 2 & 3 & 1 \\ 0 & 4 & 2 \\ 0 & 3 & 2 \end{bmatrix} \begin{bmatrix} x \\ 1 \\ -1 \end{bmatrix} = O$, then the value of $x$ is

If \(\begin{vmatrix} a & a^2 & 1+a^3 \\ b & b^2 & 1+b^3 \\ c & c^2 & 1+c^3 \end{vmatrix} = 0\) and vectors \((1, a, a^2)\), \((1, b, b^2)\) and \((1, c, c^2)\) are non-coplanar, then the product \(abc\) equals

If $A$ and $B$ are two square matrices of order $3 \times 3$ which satisfy $AB = A$ and $BA = B$, then $(A + B)^9$ is equal to

The number of real values of x satisfying x3x+22x-12x-14x3x+17x-217x+612x-1 = 0 is -

If 1, \omega and \omega^2 are the cube roots of unity, then \begin{vmatrix} 1 & \omega^n & \omega^{2n} \\ \omega^n & \omega^{2n} & 1 \\ \omega^{2n} & 1 & \omega^n \end{vmatrix} is equal to

If \(\det(A)\)=k, then det(A\) + \(A\)^{-1}) equals:

If the system of linear equations 2x + 2ay + az = 0 2x + 3by + bz = 0 2x + 4cy + cz = 0 where a, b, c ∈ R are non-zero and distinct; has a non-zero solution, then :

If a, b, c are in AP, then x+1x+2x+ax+2x+3x+bx+3x+4x+c equals -

If det(A)=k, then det(\(A\)^T\)\(A) equals:

$(I + A)^{100} =$

If \(\det(A)\)=2, then det(A\)⁻^2A^5A⁻^3) equals:

A square matrix $P$ satisfies $P^2 = I - P$, where $I$ is the identity matrix. If $P^n = 5I - 8P (n \in N)$, then minimum value of $n$ is equal to

3. If px^4 + qx^3 + rx^2 + sx + t = x2+3xx-1x+3x+12-xx-3x-3x+43x then t is equal to -

Let $A = \begin{bmatrix} 0 & 2q & r \\ p & q & -r \\ p & -q & r \end{bmatrix}$. If $AA^T = I^3$, then $|p|$ is :

If two rows of a determinant are interchanged, then determinant becomes:

If \(\det(A)\)=3, then det(A\)^5A^2A⁻^2A⁻^5A^3A⁻^3) equals:

If A = \begin{pmatrix} 1 & 0 & 0 \\ 2 & 1 & 0 \\ 3 & 2 & 1 \end{pmatrix}, then A^{20} + (adj A)^{20} is equal to

If \(\det(A)\)=k, then det(A\)^n(A\)⁻^n + \(I)(A\)⁻^n - \(I)(A\)⁻^n + \(I)^p) equals:

If \(\det(A)\)=k, then det(I\)\cdotA\cdotI) equals:

If \(\det(A)\)=k, then det((A\)^0)^{-1}) equals:

If \(\det(A)\)=k, then det((A\)^0)^n) equals:

If A = 5!6!7!6!7!8!7!8!9!, then |adj(adj(2A))| is equal to :

Let $A = \begin{bmatrix} 1 & 1 \\ 0 & 1 \end{bmatrix}$. If $B = \begin{bmatrix} 1 & 2 \\ -1 & -1 \end{bmatrix} A \begin{bmatrix} -1 & -2 \\ 1 & 1 \end{bmatrix}$, then the sum of all the elements of the matrix $\sum_{n=1}^{50} B^n$ is equal to

If \(\det(A)\)=2, then det(A\)^3A^3A⁻^5) equals:

Find the sum of all positive integral values of a for which every solution to the system of equation x + ay = 3 and ax + 4y = 6 satisfy the inequalities x > 1, y > 0.

If determinant is expanded along any row, result is:

Let a, b, c are the solutions of the cubic x3 - 5x2 + 3x - 1 = 0, then find the value of the determinant

Let $A = [a_{ij}]_{2 \times 2}$ where $a_{ij} \neq 0$ for all $i, j$ and $A^2 = I$. Let $a$ be the sum of all diagonal elements of $A$ and $b = |A|$, then $3a^2 + 4b^2$ is equal to

If x + 3 2y + x z - 1 4w - 8 = -x - 1 0 3 2w, then find the value of \(x + y + z + w\).

If \(\det(A)\)=k, then det(A\)^n(A\)⁻^n + \(I)^2) equals:

Matrices A and B satisfy \(AB = B^{-1}\), where \(B = \begin{pmatrix} 2 & -2 \\ -1 & 0 \end{pmatrix}\). Find the value of \(\lambda\) for which \(\lambda A - 2B + I = O\), without finding \(B^{-1}\).

If \(\det(A)\)=4, then det(A\)^5(A\)⁻^5 + \(I)) equals:

The total number of matrices A = 02y12xy-12x-y1, (x, y ∈ R, x ≠ y) for which AT A = 3I3 is :-

If \(\det(A)\)=k, then det(A\)^nA^{-m}) where n=m equals:

If \(\det(A)\)=2, then det(A\)^3(A\)⁻^3 + \(I)(A\)⁻^3 - \(I)) equals:

If \(\det(A)\)=k, then det(A\)^nA^mA⁻^nA⁻^mA^nA⁻^nA^mA⁻^m) equals:

If $A = \begin{bmatrix} 3 & -4 \\ 1 & -1 \end{bmatrix}$, show that $A^k = \begin{bmatrix} 1+2k & -4k \\ k & 1-2k \end{bmatrix}$, where $k$ is any positive integer.

Let A be the set of all 3 × 3 symmetric matrices all of whose entries are either 0 or 1. Five of these entries are 1 and four of them are 0.List-I(A) The number of matrices in A is(B) The number of matrices in A for which the system of linear equations Axyz=100 has a unique solution, is(C) The number of matrices in A for which the system of linear equations Axyz=100 is inconsistent, is(D) The number of matrices in A for which the system of linear equations Axyz=100 has infinitely many solutions, isList-II(P) more than 2(Q) 12(R) more than 4(S) less than 7

The value of θ lying between -π/4 & π/2 and 0 ≤ A ≤ π/2 and satisfying the equation 1+sin2 Acos2 A2sin 4θsin2 A1+cos2 A2sin 4θsin2 Acos2 A1+2sin 4θ = 0 are -

If \(\det(A)\)=k, then det(A\)^nA^mA⁻^n) equals:

If a, b, c are in AP, then x+1x+2x+ax+2x+3x+bx+3x+4x+c equals -

If the maximum and minimum values of the determinant $\begin{vmatrix} 1 + \sin^2 x & \cos x & \sin 2x \\ \sin^2 x & 1 + \cos^2 x & \sin 2x \\ \sin^2 x & \cos^2 x & 1 + \sin 2x \end{vmatrix}$ are $c$ and $d$ respectively, then $c + 2d$ is equal to

Which of the following is an orthogonal matrix -

The determinant cos(θ+ϕ)-sin(θ+ϕ)cos2ϕsinθcosθsinϕ-cosθsinθcosϕ is -