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What would be the anwser for this trinomial using foil in reverse.

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1 Answer

28y^2 + 25y + 3 = (7y+1)(4y+3)

Ideas: 28*3 = 21*4, and 21+4 = 25, the coefficient of y.

28y^2 + 25y + 3 = 28y^2+21y + 4y+3 = 7y(4y+3) + (4y+3) = (7y+1)(4y+3)

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