Is $A^2-A=A(A-I)$ in matrices?
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Matrix multiplication is distributive, yes. – Ege Erdil May 06 '16 at 23:22
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Why did you write the same thing 5 times? – Ant May 06 '16 at 23:23
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3You only have to ask it once. You only have to ask it once. You only have to ask it once. You only have to ask it once. You only have to ask it once. – Christopher Carl Heckman May 06 '16 at 23:23
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5Proving Distributivity of Matrix Multiplication contains a couple of proofs that matrix multiplication is (left) distributive over sum. First couple of lines of the accepted answer should do. – May 06 '16 at 23:30