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Quiz 2
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If \(\left[\begin{array}{cc}
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2, 2, 3, 4
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2, 3, 1, 2
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3, 3, 0, 1
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None of these
Explanation
2, 2, 3, 4
If A is a m × n matrix such that AB and BA are both defined, then B is an
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m × n matrix
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n × m matrix
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n × n matrix
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m × m matrix
Explanation
n × m matrix
If A = \(\left[\begin{array}{cc}1 & 2\\3 & 4\end{array}\right]\) then A– 5A is equal to
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2I
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3I
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-2I
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null matrix
Explanation
2I
If A and B are 2 × 2 matrices, then which of the following is true?
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(A + B)² = A² + B² + 2AB
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(A – B)² = A² + B² – 2AB
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(A – B)(A + B) = A² + AB – BA – B²
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(A + B) (A – B) = A² – B²
Explanation
(A – B)(A + B) = A² + AB – BA – B²
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