Solve each of the following quadratic equations. In every case, aim for the most streamlined working.
(a) x2−20x+96=0
(b) 5x2+11x+2=0
(c) 4x2+4x+1=0
(d) For each equation in parts (a)–(c), mention in one short phrase which solution method you found quickest and state one reason for your choice.