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MathematicsMatricesSymmetric & Skew Symmetric MatricesMedium2 minPYQ_2015
MathematicsMediummultiple choice

LetX and Ybe two arbitrary,3 ×3, non - zero, skew - symmetric matrices and Z be an arbitrary3 ×3, non - zero, symmetric matrix. Then which of the following matrices is (are) skew symmetric ?

Options:(select one or more)

Answer:
C, D
Solution:

XT=-X, YT=-YandZT=Z
P=Y3Z4-Z4Y3
PT=Z4TY3T-Y3TZ4T
= ZT4YT3-YT3ZT4
= Z4- Y3--Y3Z4
= Y3Z4  Z4Y3 = P(symmetric) 
Q=X44+Y44
QT=XT44+YT44=X44+Y44=Q(symmetric)
RT=Z3TX4T-X4TZ3T
= ZT3XT4-XT4 ZT3
= Z3-X4--X4Z3
= Z3X4-X4Z3=-R(Skew Symmetric)
S=X23+Y23
ST=XT23+YT23=-X23+-Y23
=-X23-Y23=-S(Skew symmetric)

Stream:JEE_ADVSubject:MathematicsTopic:MatricesSubtopic:Symmetric & Skew Symmetric Matrices
2mℹ️ Source: PYQ_2015

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