• Given x1=(1, 1, 1)T and x2=(3, −1, 4)T : (a) Do x1 and x2 span R3? Explain. (b) Let x3 be a third vector in R3 and set X = (x1, x2, x3). What condition(s) would X have to satisfy in order for x1, x2, and x3 to form a basis for R3