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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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lenpollock

Lvl 16
1y ago

What else can I help you with?