Completing the square help?
回答 (2)
2013-05-20 5:04 am
✔ 最佳答案
a^2 + 2a = 3a^2 + 2a + (2/2)^2 = 3 + (2/2)^2
a^2 + 2a + 1 = 3 + 1
(a + 1)^2 = 4
a + 1 = ± √4
a + 1 = ± 2
a = -1 ± 2
a = -3, 1
2013-05-20 4:53 am
a^2 +2a = 3
ADD 1
a^2 +2a +1 = 4
( a+1)^2 = 4
a = 2-1 OR -2-1
a = 1 OR -3 ANSWER
ADD 1
a^2 +2a +1 = 4
( a+1)^2 = 4
a = 2-1 OR -2-1
a = 1 OR -3 ANSWER
收錄日期: 2021-04-20 20:22:17
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20130519204833AAmNXpz