Find the values of the following expressions:
(i) 16x2+24x+9, when x=74(ii) 64x2+81y2+144xy, when x=11 and y=43(iii) 81x2+16y2−72xy, when x=23 and y=34
Find duplicate ratio of :
(i) 3 : 4 (ii) 3√3:2√5