(2) (x-2) * (x-18) = x 2-18x-2x+36 = x 2-20x+36, so m=-20.

(3) (x+3) * (x+p) = x 2+px+3x+3p, so m= 15.

(4) (x-6) * (x-p) = x 2-px-6x+6p, so m=- 12.

(5) (x+p) * (x+q) = x 2+qx+px+pq, so m = q+p.