4y
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The GCF is 6y
The GCF is 12.
The GCF of 12y^3 and 15y^2 is 3y^2
I assume the expression is y2+12y+27 as I cannot see the operation symbols between them (editor problem?). If you agree with this then y2 + 12y + 27 = y2 + 9y + 3y + 27 = y(y + 9) + 3(y + 9) = (y + 3)(y + 9)
For example the question is 6x-12y the factorised answer is 6[x-2y]