If - x 2- 18 x - 6 2- 18 6 - then x -

The correct option is B 6 Both the matrices are 2× 2 and are equal i.e., corresponding elements are also equal ⇒ x=6 ∴ x=6 ...

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Equality of Matrices

If [ x 2; 1...

Question

If $[\begin{matrix} x & 2 18 & x \end{matrix}] = [\begin{matrix} 6 & 2 18 & 6 \end{matrix}]$ , then x =

\pm 6

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6

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- 5

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7

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a_{7} + a_{6} + . . . a_{0} = ?

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∣ ∣ ∣ ∣ ∣ \begin{matrix} (5^{x} + 5^{- x})^{2} & (5^{x} - 5^{- x})^{2} & 1 (6^{x} + 6^{- x})^{2} & (6^{x} - 6^{- x})^{2} & 1 (7^{x} + 7^{- x})^{2} & (7^{x} - 7^{- x})^{2} & 1 \end{matrix} ∣ ∣ ∣ ∣ ∣

If $5 x + \frac{7}{2} = \frac{3}{2} x - 14$ , then x = ?

(a) 5

(b) -5

(d) -6

∣ ∣ ∣ ∣ \begin{matrix} x & 3 & 6 3 & 6 & x 6 & x & 3 \end{matrix} ∣ ∣ ∣ ∣ = ∣ ∣ ∣ ∣ \begin{matrix} 2 & x & 7 x & 7 & 2 7 & 2 & x \end{matrix} ∣ ∣ ∣ ∣ = ∣ ∣ ∣ ∣ \begin{matrix} 4 & 5 & x 5 & x & 4 x & 4 & 5 \end{matrix} ∣ ∣ ∣ ∣ = 0

x

Δ = ∣ ∣ ∣ ∣ ∣ ∣ \begin{matrix} 3 & 4 & 5 & x 4 & 5 & 6 & y 5 & 6 & 7 & z x & y & z & 0 \end{matrix} ∣ ∣ ∣ ∣ ∣ ∣ = 0

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