A) 3I
B) 0
C) I
D) 2I
Correct Answer: C
Solution :
[c] Given \[{{A}^{2}}=A.\] Now, \[{{(I+A)}^{3}}-7A={{I}^{3}}+3{{I}^{3}}A+3I{{A}^{2}}+{{A}^{3}}-7A\]\[=I+3A+3A+A-7A\] \[=I+O=I\]You need to login to perform this action.
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