ધારો કે $A = \begin{bmatrix} -2 & x & 1 \\ x & 1 & 1 \\ 2 & 3 & -1 \end{bmatrix}$. જો સમીકરણ $\operatorname{det}(A) = 0$ ના બીજ $l$ અને $m$ હોય,તો $l^3 - m^3$ ની કિંમત શોધો.

  • A
    $35$
  • B
    $-35$
  • C
    $19$
  • D
    $-19$

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$\left| \begin{array}{ccc} 1 & 1 & 1 \\ a & b & c \\ a^3 & b^3 & c^3 \end{array} \right| = $

જો $\left|\begin{array}{ccc}1+x & 1 & 1 \\ 1+y & 1+2 y & 1 \\ 1+z & 1+z & 1+3 z\end{array}\right| = 10 k x y z \left(3+\frac{1}{x}+\frac{1}{y}+\frac{1}{z}\right)$ હોય,તો $k = \text{ . . . . . . }$ (જ્યાં $x, y, z \neq 0$ અને $3+\frac{1}{x}+\frac{1}{y}+\frac{1}{z} \neq 0$).

ધારો કે $\omega = -\frac{1}{2} + i \frac{\sqrt{3}}{2}$,જ્યાં $i = \sqrt{-1}$. તો $\left| \begin{array}{ccc} 1 & 1 & 1 \\ 1 & -1-\omega^2 & \omega^2 \\ 1 & \omega^2 & \omega^4 \end{array} \right|$ નું મૂલ્ય શોધો.

જો $\alpha, \beta, \gamma$ એ સમીકરણ $\left|\begin{array}{ccc}x & 2 & 2 \\ 2 & x & 2 \\ 2 & 2 & x\end{array}\right|=0$ ના બીજ હોય અને $\min (\alpha, \beta, \gamma)=\alpha$ હોય, તો $2 \alpha+3 \beta+4 \gamma=$

જો $a, b, c$ ભિન્ન અને સંમેય સંખ્યાઓ હોય,તો નિશ્ચાયક $\left| \begin{array}{ccc} (a^2 + b^2 + c^2) & (ab + bc + ca) & (ab + bc + ca) \\ (ab + bc + ca) & (a^2 + b^2 + c^2) & (ab + bc + ca) \\ (ab + bc + ca) & (ab + bc + ca) & (a^2 + b^2 + c^2) \end{array} \right|$ નું મૂલ્ય હંમેશા શું હોય?

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