Which of the following sets are linear spacesa x x1 x2 x3


Which of the following sets are linear spaces?a) {X = (x1, x2, x3) in R3 with the property x1 - 2x3 = 0}b) The set of solutions x of Ax = 0, where A is an m × n matrix.c) The set of 2 × 2 matrices A with det(A) = 0.d) The set of polynomials p(x) with R1-1 p(x) dx = 0.e) The set of solutions y = y(t) of y'' + 4y' + y = 0

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