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4x^(2) + 28xy + 49y^(2) ->
(2x)^(2) + 28xy + (7y)^2
Split into brackets
( 2x + 7y)(2x + 7y)
If you applyuFOIL you will find toy come to '28xy'.
The clue to this problem is to note that '4' ^ '49' are both squared numbers.
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