Question

Let matrix A=[8 -2]
[4 7]
Let matrix B=2A.
find b22.

Answer 1

14

Explanation:

b22 = 2×a22 = 2×7 = 14

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Multiplication of a matrix by a scalar is the same as multiplying every element of that matrix by that scalar.

`B=2A=2\left[\begin{array}{cc}8&-2\\4&7\end{array}\right]=\left[\begin{array}{cc}16&-4\\8&14\end{array}\right]\\\\b_(22)=14`