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If `I` is the identity matrix and `A` is a square matrix such that `A^2=A` , then what is the value of `(I+A)^2-3A` ?

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Here, `A^2 = A`
`(I+A)^2 = I^2+A^2+2IA`
`=I+A+2A=I+3A`
`:. (I+A)^2-3A = I+3A-3A = I`
So, given expression is equal to identity matrix.
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