Evaluate : (i) (8)3 (ii) (15)3 (iii) (21)3 (iv) (60)3
(i) (8)3=8×8×8=512 (ii) (15)3=15×15×15=3375 (iii) (21)3=21×21×21=9261 (iv) (60)3=60×60×60=216000
Evaluate each of the following using identities:
(i) (399)2
(ii) (0.98)2
(iii) 991×1009
(iv) 117×83