easy math..

2009-12-06 12:18 am

expand the following question...@@
1. (8x^2-7x-5)(5-4x)
2. (3x^2-x)(4x+3)
simplify the following qquestion
3. (3x^2+2x-4)(x-3)+7
4. (8x^2-7x+3)(2x+1)5x-9
5. (9x^2-2X+8)(6x-7)-(2x^2+5x)(2x-6)
find the quotient and the remainder of each of the following divisions
6. (x^2-6x+4) / (x+5)
7. (10x+x^2-39) / (x-3)
8. (x^3-7x^2+10) / (x-1)
9. (x^3+6x^2+2x +9) / (x-3)
10. (x^3-6x^2+15x+8) / (x^2+2x+1)

回答 (1)

用戶9724

2009-12-06 12:40 am

✔ 最佳答案

expand the following question...@@
1. (8x^2-7x-5)(5-4x)
=-32x^3+28x^2+20x+40x^2-35x-25
=-32x^3+68x^2-15x-25

2. (3x^2-x)(4x+3)
=12x^3-4x^2+9x^2-3x
=12x^3+5x^2-3x

simplify the following qquestion
3. (3x^2+2x-4)(x-3)+7
=3x^3+2x^2-4x-9x^2-6x+12+7
=3x^3-7x^2-10x+19

4. (8x^2-7x+3)(2x+1)5x-9
=(8x^2-7x+3)(10x^2+5x)-9
=80x^4-70x^3+30x^2+40x^3-35x^2+15x-9
=80x^4-30x^3-5x^2+15x-9

5. (9x^2-2X+8)(6x-7)-(2x^2+5x)(2x-6)
=(54x^3-75x^2+62x-56)-(4x^3-2x^2-30x)
=50x^3-73x^2+92x-56

6. (x^2-6x+4) / (x+5)
=(x-11)......(59)

7. (10x+x^2-39) / (x-3)
=(x+13).........(0)

8. (x^3-7x^2+10) / (x-1)
=(x^2+x-6)........(4)

9. (x^3+6x^2+2x +9) / (x-3)
=(x^2+9x+29)..........(96)

10. (x^3-6x^2+15x+8) / (x^2+2x+1)
=(x-8)..........(30x+16)

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