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2y^4 - 13y^3z - 132y^2z^2
= y^2 (2y^2 - 13yz -132z^2) [removing the common factor y^2 from all the terms]
= y^2(2y^2 - 24yz + 11yz - 132z^2) [splitting the middle term]
= y^2[2y(y - 12z) + 11z(y - 12z)]
= y^2[(y - 12z)(2y + 11z)]
= y^2(y - 12z)(2y+ 11z)
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