Using property of square numbers, the value of 15 x 17 is:

Asked by Petulla Mishra | 30th Nov, 2014, 10:04: PM

Expert Answer:

R e w r i t i n g space t h e space g i v e n space e x p r e s s i o n space a s : 15 cross times 17 equals open parentheses 16 minus 1 close parentheses cross times open parentheses 16 plus 1 close parentheses equals 16 squared minus 1 squared space space space space space open square brackets because open parentheses a plus b close parentheses open parentheses a minus b close parentheses equals a squared minus b squared close square brackets equals 256 minus 1 equals 255

Answered by Vimala Ramamurthy | 1st Dec, 2014, 08:32: AM