Evaluate
9+2y^{2}-17xy
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9+2y^{2}-17xy
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4xy-y^{2}+\left(-21x+3y\right)y+9
Use the distributive property to multiply -7x+y by 3.
4xy-y^{2}-21xy+3y^{2}+9
Use the distributive property to multiply -21x+3y by y.
-17xy-y^{2}+3y^{2}+9
Combine 4xy and -21xy to get -17xy.
-17xy+2y^{2}+9
Combine -y^{2} and 3y^{2} to get 2y^{2}.
4xy-y^{2}+\left(-21x+3y\right)y+9
Use the distributive property to multiply -7x+y by 3.
4xy-y^{2}-21xy+3y^{2}+9
Use the distributive property to multiply -21x+3y by y.
-17xy-y^{2}+3y^{2}+9
Combine 4xy and -21xy to get -17xy.
-17xy+2y^{2}+9
Combine -y^{2} and 3y^{2} to get 2y^{2}.
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