✔ 最佳答案
(1) find the quotient and remainder when [(3x^3 +2x -3 )-(x^3-4x^2+4)]
÷ (x^2 -3x + 5)
[(3x^3 +2x -3 )-(x^3-4x^2+4)] ÷ (x^2 -3x + 5)
=(2x³+6x²+2x-7) ÷ (x² -3x + 5)
2x + 12
______
(x² -3x + 5) ) 2x³+6x²+2x-7
2x³-6x²+10x
___________
12x²-8x-7
12x²-36x+60
__________
28x-67
quotient = 2x + 12
remainder = 28x-67
(2) When 3x^3 - 5x^2 + x +p is divided by x^2-x-6 , the quotient and remainder are 3x-2 and qx-18 respectively. Find the values of p and q.
3x - 2
______
(x² -x - 6 ) ) 3x³-5x²+x+p
3x³-3x²-18x
___________
-2x²-19x+p
-2x²+2x+12
__________
17x+(p-12)
17x+(p-12) = qx-18
q = 17
p=-6
2014-03-01 15:40:49 補充:
3x - 2
______
(x² -x - 6 ) ) 3x³-5x²+x+p
3x³-3x²-18x
___________
-2x²+19x+p [ 19x 錯± ]
-2x²+2x+12
__________
17x+(p-12)
2014-03-01 17:39:54 補充:
又計錯!
(1) find the quotient and remainder when [(3x^3 +2x -3 )-(x^3-4x^2+4)]
÷ (x^2 -3x + 5)
[(3x^3 +2x -3 )-(x^3-4x^2+4)] ÷ (x^2 -3x + 5)
=(2x³+4x²+2x-7) ÷ (x² -3x + 5)
2014-03-01 17:40:40 補充:
2x+10
──────────────
x2-3x+5)2x3+4x2+ 2x-7
)2x3-6x2+10x
)─────────────
)10x2- 8x- 7
)10x2-30x+50
)─────────────
)22x-57
quotient=2x+10
remainder=22x-57
2014-03-01 17:41:19 補充:
多謝 螞蟻雄兵 ( 知識長 ) 更正