I just wanted to ask if these questions are going to give actual values and not just variables or polynomials as answers. For 11 I would like to see the work done because it's so confusing and long that I'm not sure what to expect. As for 12, the answers are fine, but I wanted to see if the answer for 12 b and c gave a polynomial as the answer (I might be doing it wrong).

11. Factor first and then simplify. a) 8(x3 - 1) 5 ( 2x + 7)3 + 15x2(x3 - 1) 4(2x + 7)4 b) 6(x3+ 4)-1 - 3x2(6x - 5) (x3 + 4)-2 7 () 2x- - 2x2 d) 1+ 2x -1+ x-2 12. Determine the value of y when x = 4. a) y = 612 - 1, u = Vx b) y = - 5 3su=9- 2x () y=-12 + 3u+1, u=5x -18