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9y**2-25yz-6z**2

Multiply first and last terms

9*-6=-54

Find factors of -54

2,-27 = 2+-27=-25

-2,27 = -2+27=25

Rewrite

9y**2-27zy+2zy-6z**2

Factor pairs of terms

9y**2-27zy = 9y(y-3z)

2zy-6z**2= 2z(y-3z)

9y**2-27zy+2zy-6z**2= 9y(y-3z)+2z(y-3z)

Factor:

9y(y-3z)+2z(y-3z) = (y-3z)(9y+2z)

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14y ago

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