15y4-39y3+18y2
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gcf difference of two squares guess ad check/ box method
(c - 3d - 2)(c - 3d + 2)
a2 - b2 = (a - b)(a + b)
a2 - b2 = (a - b)(a + b)
For the first step, express this as a difference of two squares, and use the corresponding formula. After factoring this, one of the two factors will again be the difference of two squares, and can be further factored.