Determine if b is a linear combination of ai, a2 and a3. If so, write b as such. 2 5 (a) b = []} a₁ = -2, ₂ = 1 a3 = 6 2 8 -5 (b) b = 11 a₁ -2 = 5 a3 = 2 3 1 (c) b = -7 ai 0 a₂ = 3 (d) b=-5, ai = 0 H 9 = 7 7 a₂ 4 3 [infinity] 8 -2 " 3 7 a3 = 129 a3 0 5 2 5