The trinomial 2x2+11x+12 represents a certain algebraic expression in variable x. Let its zeros be α and β.
(i) Determine α+β and αβ.
(ii) Using the results of part (i), find the numerical value of the expression α+β+αβ.
(iii) Form the quadratic polynomial whose zeros are (α−1) and (β−1), writing your answer in the standard form kx2+mx+n with integer coefficients.