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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)

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13y ago

What else can I help you with?