if A²=A find (I+A)³-7A
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Step-by-step explanation:
A²=A
A²-A=0
A(A-1)=0
A=0 or A=1
if A=0:
(I+A)³-7A=0
if A=1:
(I+A)³-7A=(1+1)³-7=2³-7=1
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