Question: [1 markfor completion] Let =2 1 01 Find all 22 matrices B with the property that AB = BA. [Hint: if you find a matrix

[1 markfor completion] Let =2 1 01 Find all 22 matrices B with the property that AB = BA. [Hint: if you find a matrix B with this property, then all multiples of B will have the property. So your gen- eral formula for B will have the form: B = kC where k is a scalar parameter

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