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Do you mean some thing like 4x2 - 28xy + 49y2 ?

notice 4x2 = (2x)2 and 49y2 = either (7y)2 or (-7y)2 (1st and last terms must be squares) and the middle term is 2(2x)(-7y) (2 times sq root of 1st times sq root of last)

Once the pattern is recognized:

(sq root 1st + sqroot 2nd)2 or (sq root 1st - sqroot 2nd)2 depending on if middle term is positive or negative.

So, back to my example:

4x2 - 28xy + 49y2 = (2x - 7y)2 because middle is negative.

Simpler example factor x2 + 6x + 9. 1st and last are both squares

sq root of 9 = 3 3 times 2 = 6 that fits the middle

so x2 + 6x + 9 = (x + 3)2

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