Posted by priya on Sunday, October 17, 2010 at 9:07pm.
Yes, but the sqrt49 is widely known as 7
47(23+36- 7)
=4*2*7*3 +4*3*7*6 -4*7*7
=8*21 +12*42 -4*49
=8*21+ 12*(21*2) -4*7
=8*21 +12*21+ 12*2- 28
=4*2*21 +4*3*21 +4*3*2 -28
=4*21*(2+3*2)-28
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