QUESTION 1 True or false. The set S (1,x2, x²+2) spans P₂- a. false b. true QUESTION 2 04 0 Find the determinant of 6 -4 12 by the method of expansion by cofactors. -2 0 -12J a. 176 b.-384 c. 384 d. 192 e.-48 QUESTION 3 True or false. The set of all nxn singular (non-invertible) matrices is a subspace of M True False