(5x+1) (3x^2-5x+2) - (x^3-4x^2+x-4) simplify expression?
回答 (4)
2009-07-04 9:27 am
✔ 最佳答案
= ([5x + 1][3x² - 5x + 2]) - (x³ - 4x² + x - 4)= 15x³ - 25x² + 10x + 3x² - 5x + 2 - x³ + 4x² - x + 4
= 14x³ - 18x² + 4x + 6
= 2(7x³ - 9x² + 2x + 3)
Answer: 2(7x³ - 9x² + 2x + 3)
2009-07-04 6:14 pm
15 x^3 - 25 x^2 + 10x
________3 x^2 - 5 x + 2
- x^3 + 4x^2 - x + 4
14 x^3 - 18 x^2 + 4x + 6
________3 x^2 - 5 x + 2
- x^3 + 4x^2 - x + 4
14 x^3 - 18 x^2 + 4x + 6
2009-07-04 4:53 pm
(5x + 1)(3x^2 - 5x + 2) - (x^3 - 4x^2 + x - 4)
= 5x(3x^2) + 1(3x^2) - 5x(5x) - 1(5x) + 5x(2) + 1(2) - x^3 + 4x^2 - x + 4
= 15x^3 + 3x^2 - 25x^2 - 5x + 10x + 2 - x^3 + 4x^2 - x + 4
= 15x^3 - x^3 - 22x^2 + 4x^2 - 5x + 10x - x + 2 + 4
= 14x^3 - 18x^2 + 4x + 6
= 2(7x^3 - 9x^2 + 2x + 3)
= 5x(3x^2) + 1(3x^2) - 5x(5x) - 1(5x) + 5x(2) + 1(2) - x^3 + 4x^2 - x + 4
= 15x^3 + 3x^2 - 25x^2 - 5x + 10x + 2 - x^3 + 4x^2 - x + 4
= 15x^3 - x^3 - 22x^2 + 4x^2 - 5x + 10x - x + 2 + 4
= 14x^3 - 18x^2 + 4x + 6
= 2(7x^3 - 9x^2 + 2x + 3)
2009-07-04 4:23 pm
(5x+1) (3x^2-5x+2) - (x^3-4x^2+x-4)=
15x^3-25x^2+10x+3x^2-5x+2-x^3+4x^2-x+4=
14 x^3-18 x^2+4 x+6
15x^3-25x^2+10x+3x^2-5x+2-x^3+4x^2-x+4=
14 x^3-18 x^2+4 x+6
收錄日期: 2021-05-01 12:37:34
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