मराठी

Show that ∣ ∣ ∣ ∣ X + 1 X + 2 X + a X + 2 X + 3 X + B X + 3 X + 4 X + C ∣ ∣ ∣ ∣ = 0 Where A, B, C Are in a . P . - Mathematics

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प्रश्न

Show that

\[\begin{vmatrix}x + 1 & x + 2 & x + a \\ x + 2 & x + 3 & x + b \\ x + 3 & x + 4 & x + c\end{vmatrix} =\text{ 0 where a, b, c are in A . P .}\]

 

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उत्तर

Given: a, b, c are in A.P.

\[2b = a + c\]

\[∆ = \begin{vmatrix}x + 1 & x + 2 & x + a \\ x + 2 & x + 3 & x + b \\ x + 3 & x + 4 & x + c\end{vmatrix} \left[\text{ Applying }R_2 = 2 R_2 \right]\] 

\[ ∆ = \frac{1}{2}\begin{vmatrix}x + 1 & x + 2 & x + a \\ 2x + 4 & 2x + 6 & 2x + 2b \\ x + 3 & x + 4 & x + c\end{vmatrix} \] 

\[ ∆ = \frac{1}{2}\begin{vmatrix}x + 1 & x + 2 & x + a \\ 0 & 0 & 0 \\ x + 3 & x + 4 & x + c\end{vmatrix} \left[ \because 2b = a + c \right] \left[\text{ Applying }R_2 \to R_2 - \left( R_1 + R_3 \right) \right]\] 
\[ ∆ = 0\]

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पाठ 6: Determinants - Exercise 6.2 [पृष्ठ ६१]

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आरडी शर्मा Mathematics [English] Class 12
पाठ 6 Determinants
Exercise 6.2 | Q 47 | पृष्ठ ६१

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