Answer:
(3+3y)²=9+9y+9y+9y²
=9y²+18y+9
(X+4)(x-5)=x²-5x+4x-20
=x²-x-20
(2x+3y)(3x-2y)=6x²-4xy+9xy-6y²
=6x²+5xy-6y²
(X+5)(x-5)=x²-5x-5x-25
=x²-25
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Answer:
(3+3y)²=9+9y+9y+9y²
=9y²+18y+9
(X+4)(x-5)=x²-5x+4x-20
=x²-x-20
(2x+3y)(3x-2y)=6x²-4xy+9xy-6y²
=6x²+5xy-6y²
(X+5)(x-5)=x²-5x-5x-25
=x²-25