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Factor 6y^2(y^2+6y+9) completely.

User Rdiz
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6y^2(y^2+6y+9)\\\\=6y^2(y^2+2\cdot 3 \cdot y + 3^2)\\\\=6y^2(y+3)^2\\\\=6y^2(y+3)(y+3)

User JPTremblay
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