唔識做功課7
回答 (4)
2012-10-24 10:19 pm
✔ 最佳答案
Factors of 48 = 1, 2, 3, 4, 6, 8, 12, 16, 24 and 48By direct substitution, x3 - 28x + 48 = 0 when x = 2
Hence by factor theorem, x - 2 is a factor of x3 - 28x + 48 and by long division:
x3 - 28x + 48 = (x - 2)(x2 + 2x - 24)
= (x - 2)(x + 6)(x - 4)
參考: 原創答案
2012-10-28 10:16 pm
x3 - 28x + 48 = (x - 2)(x2 + 2x - 24)
= (x - 2)(x + 6)(x - 4)
= (x - 2)(x + 6)(x - 4)
2012-10-25 2:43 am
x^3-28x+48
=(x-2)(x^2+2x-24)
=(x-2)(x-4)(x+6)
=(x-2)(x^2+2x-24)
=(x-2)(x-4)(x+6)
2012-10-24 10:50 pm
可唔可以用中文解釋比我知呀！我都係唔明白點解會係咁,唔該^0^
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20121024000051KK00204