Answer:
1. 6+x, 2. 8 + 7x^2 - 2x + 5x^3, 3. 16x^3+11x^2-17x-12, 4. (x-2)(x+9), 5. 2x+3)(2x-3), 6. 2x(x+2)(x+5)
Step-by-step explanation:
Number 1
1. 2-3x+5+7+4x-8
2. 7-3x+7+4x-8
3. 14-3x+4x-8
4. 14+x-8
5. 6+x
Number 2
1. 8+3x^2+x -5x^3+4x^2-3x
2. 8+7x^2+x+5x^3-3x
3. 8+7x^2-2x+5x^3
Number 3
1.(simplify) 10x^3 + 5x^2 - 20x + 6x^2 + 3x - 12
2. 16x^3+5^2-20x+6^2+3x-12
3. 16x^3+11x^2-20x+3x-12
4. 16x^3+11x^2-17x-12
Number 4
(x-2)(x+9)
Number 5
(2x+3)(2x-3)
Number 6
2x(x^2+7x+10) or 2x(x+2)(x+5)
