Question No. 4 (Instant Drill Corner 6.8)
Factorize the following polynomials.
3. 2x(3次方)+ 5x(2次方)-7x+2 (model ans: (2x-1) ( x(2次方)+3x-2) )
我取 2x(3次方)的 coefficient 2, 和 constant term 2 能先找 出 factor (2x-1), 但如果 我 想先找出 factor (x (2次方)+3x-2)的 话 又该 怎么找?怎么 抽取?
Question No. 5
x(2次方)-x-3 cannot be further factorized into factors with integral coefficients.
唔记得 这段文字中 integral 的 定义 是什么? 我觉得 负数如 -3 ,正数 3, 和 0, 都算是 integral / integer 吧?
Question No. 6 (Exercise 6B)
31.(a) Find the remainder of (x+1)(2015次方) / x. (model ans: 1)
(b) Using the result of (a), find the remainder of 8(2015次方) /7. (model ans:1)
这题 知道 答案, 但请问 题(b) 怎样 列式?