If and I is unit matrix of order 2 × 2. Find : IB

Engineering

Mathematics

Introduction to Matrix

Algebra of Matrices

Question

If $A = [\begin{array}{cc} 0 & 2 \\ 5 & - 2 \end{array}], B = [\begin{array}{cc} 1 & - 1 \\ 3 & 2 \end{array}]$ and I is unit matrix of order 2 × 2. Find : IB

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$IB = [\begin{array}{cc} 1 & 0 \\ 0 & 1 \end{array}] [\begin{array}{cc} 1 & - 1 \\ 3 & 2 \end{array}]$
$= [\begin{array}{cc} 1 + 0 & - 1 + 0 \\ 0 + 3 & 0 + 2 \end{array}]$

$= [\begin{array}{cc} 1 & - 1 \\ 3 & 2 \end{array}]$