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If matrix A=[[2,-2],[-2, 2]] and A^2=p A...

If matrix `A=[[2,-2],[-2, 2]]` and `A^2=p A` , then write the value of `p`

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Given that,
`A=[[2,-2],[-2, 2]]`
`A^2=[[2,-2],[-2, 2]][[2,-2],[-2, 2]]`
`A^2=[[8,-8],[-8, 8]]`
`A^2=pA`
`[[8,--8],[-8, 8]]=p[[2,-2],[-2, 2]]`
`p=4`

Hence, the value of `p=4`
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