Engineering Board Exam Reviewer · Matrix Operations · medium

Given A= bmatrix1&2\-1&3 bmatrix, find A2.

1. bmatrix1&4\1&9 bmatrix
2. bmatrix-1&8\-4&7 bmatrix
3. bmatrix5&5\5&10 bmatrix
4. bmatrix-1&8\4&7 bmatrix

Answer

B. bmatrix-1&8\-4&7 bmatrix

Solution

A2=A· A= bmatrix-1&8\-4&7 bmatrix. Squaring each entry separately is not matrix multiplication.

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