a^2-9a-10=0 Please Solve This for a?
回答 (3)
2008-10-02 5:18 am
✔ 最佳答案
a^2 - 9a - 10 = 0a^2 + a - 10a - 10 = 0
(a^2 + a) - (10a + 10) = 0
a(a + 1) - 10(a + 1) = 0
(a + 1)(a - 10) = 0
a + 1 = 0
a = -1
a - 10 = 0
a = 10
∴ a = -1 , 10
2008-10-02 11:52 am
factor the equation: (a - 10)(a + 1) = 0
set each part = 0: a - 10 = 0
a + 1 = 0
solve for a: a = 10, or a = -1
set each part = 0: a - 10 = 0
a + 1 = 0
solve for a: a = 10, or a = -1
2008-10-02 11:49 am
(a-10)(a+1)
a=10
a=-1
a=10
a=-1
收錄日期: 2021-05-01 11:15:36
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20081001204515AAZohk8