Answer:
1.x²+4x-16
2.x²-6x-72
3.x²+13x+36
4.x²+8x+12
5.x²+15x+54
6.x²+5x-20
7.x²-9
8.x²+20x+100
9.x²+9x-36
10.x²+x-12
11.x²+7x+10
12.x²-7x+12
13.x²-64
14.x²-3x-18
15.x²-4x-5
Step-by-step explanation:
1.(x - 2)(x + 8)
= x(x + 8)-2(x + 8)
= x²+8x-2x-16
=x²+4x-16
2.(x + 6)(x - 12)
=x(x -12)+6(x -12)
=x²-12x+6x-72
=x²-6x-72
3.(x + 9)(x + 4)
=x(x + 4)+9(x + 4)
=x²+4x+9x+36
=x²+13x+36
4. (x + 6)(x + 2)
=x(x + 2)+6(x + 2)
=x²+2x+6x+12
=x²+8x+12
5. (x + 6)(x + 9)
=x(x + 9)+6(x + 9)
=x²+9x+6x+54
=x²+15x+54
6. (x - 4)(x+ 5)
=x(x + 5)-4(x + 5)
=x²+5x-4x-20
=x²+5x-20
7. (x + 3)(x - 3)
=x(x - 3)+3(x -3)
=x²-3x+3x-9
=x²-9
8. (x + 10)(x + 10)
=x(x + 10)+10(x + 10)
=x²+10x+10x+100
=x²+20x-100
9. (x - 3)(x + 12)
=x(x + 12)-3(x + 12)
=x²+12x-3x-36
=x²+9x-36
10. (x + 4)(x - 3)
=x(x - 3)+4(x - 3)
=x²-3x+4x-12
=x²+x-12
11. (x + 5)(x + 2)
=x(x + 2)+5(x + 2)
=x²+2x+5x+10
=x²+7x+10
12. (x - 3)(x - 4)
=x(x -4)-3(x -4)
=x²-4x-3x+12
=x²-7x+12
13. (x + 8)(x - 8)
=x(x - 8)+8(x - 8)
=x²-8x+8x-64
=x²-64
14. (x -6)(x+3)
=x(x + 3)-6(x + 3)
=x²+3x-6x-18
=x²-3x-18
15. (x + 1)(x - 5)
=x(x - 5)+1(x - 5)
=x²-5x+x-5
=x²-4x-5
