This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
Well,obviously it can be done without a calculator! Motivation:When we see 3 0 4 ,we think that if we can manipulate the second part a bit to get 3 0 4 − something ,then that "something" would be our answer,then since there is multiplication sign we get the idea of ( a − b ) ( a + b ) = a 2 − b 2 ,and then ( a 2 − b 2 ) ( a 2 + b 2 ) = a 4 − b 4 ,precisely what we need here a = 3 0 ,the first part is: 2 6 = ( 3 0 − 4 ) ,now we require 3 0 + 4 ,so we write the given expression as 3 0 4 − ( 3 0 − 4 ) ( 3 0 + 4 ) × 4 × 2 2 9 ,yup!it fits perfectly,so now we have ( 3 0 2 − 4 2 ,we need 3 0 2 + 4 2 = 9 1 6 = 4 × 2 2 9 ,so 3 0 4 − ( 3 0 2 − 4 2 ) ( 3 0 2 + 4 2 ) = 3 0 4 − ( 3 0 4 − 4 4 ) = 4 4 = 2 5 6 ,and done!