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3 and 4 .Determinants and Matrices
normal
જો $A$ અને $B$ એ $n$ કક્ષાનો ચોરચ શ્રેણિક હોય તો ${(A - B)^2}$ = . . .
A
${A^2} - {B^2}$
B
${A^2} - 2AB + {B^2}$
C
${A^2} + 2AB + {B^2}$
D
${A^2} - AB - BA + {B^2}$
Solution
(d) Given, $A$ and $B$ are square matrices of order $n × n$. We know that ${(A – B)^2} = (A – B)\,\,(A – B)$
$ = {A^2} – AB – BA + {B^2}$
Note that $AB \ne BA$ in general.
Standard 12
Mathematics