求(x+1)(x-2)
2.己知f(x)=5x^3 - 2x^2 + kx -1及 g(x)= -x^3 + 2kx^2 - 3x +4
a) 當f(x)除x-1時,餘數相等,求k
5-2+k-1=-1+2k-3+4
k-8=2k
-8=k
b)由此,求f(x)-g(x)
f(x)-g(x) =5x^3 - 2x^2 -8x -1 +x^3 +16x^2 +3x -4
=6x^3+14x^2 -5x -5
然後就唔識解落去
x我代過正負(1/2/0.5/0.3333333....)都好似唔岩
所以求高手解答.....
3.另外我想搵一個輸入方程毫會show條方程既圖像出黎既website......
感謝....
更新1:
更正 題1係f(X)除(x+1)(x-2)時的餘式!
更新2:
f(x)=(x^2-x+2)Q(x)+ax+b Index of Remainder is smaller than 2 唔好意思 可唔可以比多少少tips 點解ax+b係細過2 ????