If A is square matrix such that A2 = A, then (I + A)³ – 7 A is equal to
(A) A
(B) I – A
(C) I
(D) 3A
Summary
® A matrix is an ordered rectangular array of numbers or functions ® A matrix having m rows and n columns is called a matrix of order m × n ® [aij]m × 1 is a column matrix ® [aij]1 × n is a row matrix