Question

Some equations are solved on the basis of a certain system. Find the correct answer for the unsolved equation on that basis. If $324\times 289=35,441\times 484=43,625\times 400=45$, find the value of $256\times 729$.

• A. $33$
• B. $35$
• C. $43$
• D. $34$

Answer 1

The correct option is C $43$

324×289=324−−−√+289−−−√=18+7=35

441×484=441−−−√+484−−−√=21+22=43

625×400=625−−−√+400−−−√=25+20=45

Therefore, 256×729=256−−−√+729−−−√=16+27=43.