What number is not a perfect square: 1280, 729 , 5329 or 3600?

1 Answer
Don't Memorise
Jul 6, 2015

#sqrt(1280) =color(red)( 35.77# , so this is not a perfect square.

Explanation:

#sqrt729 =sqrt(27 . 27) =27#

#sqrt 5329 = sqrt(73 . 73) = 73#

#sqrt3600 = sqrt(60.60) = 60#
The above all are perfect squares, whereas

#sqrt(1280) =color(red)( 35.77# , so this is not a perfect square.

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