(1)4n²+4n-15; (2)6a²+a-35;(3)5x²-8x-13; (4)4x²+15x+9(5)15x²+x-2; (6)6y²+19y+10;(7)20-9y-20y²; (8)7(x-1) ²+4(x-1)(y+2)-20(y+2)

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(1)4n²+4n-15; (2)6a²+a-35;(3)5x²-8x-13; (4)4x²+15x+9(5)15x²+x-2; (6)6y²+19y+10;(7)20-9y-20y²; (8)7(x-1) ²+4(x-1)(y+2)-20(y+2)
(1)4n²+4n-15; (2)6a²+a-35;
(3)5x²-8x-13; (4)4x²+15x+9
(5)15x²+x-2; (6)6y²+19y+10;
(7)20-9y-20y²; (8)7(x-1) ²+4(x-1)(y+2)-20(y+2)

(1)4n²+4n-15; (2)6a²+a-35;(3)5x²-8x-13; (4)4x²+15x+9(5)15x²+x-2; (6)6y²+19y+10;(7)20-9y-20y²; (8)7(x-1) ²+4(x-1)(y+2)-20(y+2)
(7) 20-9y-20y²=-(20y²+9y-20)=-(4y+5)(5y-4)=(4-5y)(5+4y)
(8)7(x-1) ²+4(x-1)(y+2)-20(y+2)=[(x-1)+2(y+2)][7(x-1)-10(y+2)]