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1)2x2-5x-12; (2)3x2-5x-2;
(3)6x2-13x+5; (4)7x2-19x-6;
(5)12x2-13x+3; (6)4x2+24x+27.
(1)6x2-13xy+6y2; (2)8x2y2+6xy-35;
(3)18x2-21xy+5y2; (4)2(a+b) 2+(a+b)(a-b)-6(a-b) 2.
(1)2x2+3x+1; (2)2y2+y-6;
(3)6x2-13x+6; (4)3a2-7a-6;
(5)6x2-11xy+3y2; (6)4m2+8mn+3n2;
(7)10x2-21xy+2y2; (8)8m2-22mn+15n2.
(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.x^2+2x-8
2.x^2+3x-10
3.x^2-x-20
4.x^2+x-6
5.2x^2+5x-3
6.6x^2+4x-2
7.x^2-2x-3
8.x^2+6x+8
9.x^2-x-12
10.x^2-7x+10
11.6x^2+x+2
12.4x^2+4x-3
(3)6x2-13x+5; (4)7x2-19x-6;
(5)12x2-13x+3; (6)4x2+24x+27.
(1)6x2-13xy+6y2; (2)8x2y2+6xy-35;
(3)18x2-21xy+5y2; (4)2(a+b) 2+(a+b)(a-b)-6(a-b) 2.
(1)2x2+3x+1; (2)2y2+y-6;
(3)6x2-13x+6; (4)3a2-7a-6;
(5)6x2-11xy+3y2; (6)4m2+8mn+3n2;
(7)10x2-21xy+2y2; (8)8m2-22mn+15n2.
(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.x^2+2x-8
2.x^2+3x-10
3.x^2-x-20
4.x^2+x-6
5.2x^2+5x-3
6.6x^2+4x-2
7.x^2-2x-3
8.x^2+6x+8
9.x^2-x-12
10.x^2-7x+10
11.6x^2+x+2
12.4x^2+4x-3
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