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Question

Mathematics Question on Symmetric and Skew Symmetric Matrices

If the matrix A=[x25y 209\103z0]A =\begin{bmatrix}x&-2 &-5y\\\ 2&0& -9 \\\10& 3z &0\end{bmatrix}is skew-symmetric, then the value of (2x3y+4z)(2x-3y+4z) is:

A

5

B

6

C

0

D

-2

Answer

6

Explanation

Solution

The correct option is (B):6