Algebra 2 need help on question?
回答 (2)
2015-08-14 8:18 pm
✔ 最佳答案
[ 4 + 5i ] [5 + 5i ]-----------------------
[ 5 - 5i ] [ 5 + 5i ]
20 + 45i - 25
------------------
25 + 25
-5 + 45i
------------
50
-1 + 9i
-----------
10
2015-08-14 7:32 pm
"rationalize the denominator"
That means multiply top and bottom by something that will make the denominator a rational number.
i.e. (1+i)
(4+5i)(1+i) / (5-5i)(1+i)
(4 + 5i + 4i - 5) / 10
(-1 + 9i) / 10
That means multiply top and bottom by something that will make the denominator a rational number.
i.e. (1+i)
(4+5i)(1+i) / (5-5i)(1+i)
(4 + 5i + 4i - 5) / 10
(-1 + 9i) / 10
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20150814112550AA75Y0e