SOLUTION: (a-3)(a2 -3a + 4) is the problem = a3 - 6a2 + 13a - 12 is the solution and I don't have a clue as to how the 13a plugs including the 12

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: (a-3)(a2 -3a + 4) is the problem = a3 - 6a2 + 13a - 12 is the solution and I don't have a clue as to how the 13a plugs including the 12      Log On