y^2 + 7y + 12 = (y+4)(y+3)
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5x(6x + 7y + 8)
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.
(9,6)
If you mean: (2x-7y)(x+y) then it is 2x squared -5xy -7y squared
(y + 5) (y + 2)