B. Find the sum of the following polynomials
1.) (12x3 - 2x2 - X + 3) and x3 + X-4)
2.) (4x2 + 5x - 4) and 2(x2 - 3x + 2)
3.) (3x3 + x2 - 1) and 3(-x3+ x2 + 5)
4.) 2(x2 + 3x +4) and (-2x2 -5x + 1)
5.) (8x3 - 3x2 + X-1) and 3(x2 +2x - 5)​