solve the equation:
1) x^3 - 8x^2 +7x = 0
2a) By substituting √x^2 + 5x +1 = u, show that the expression 3x^2 + 15x + 2√x^2 +5x +1 can be transformed into 3u^2 +2u -3.
2b) Hence, solve 3x^2 +15x +2 √x^2 +5x+1 = 2
3a) Show that x^2 + x +2x√x+2 = (x + √x + 2)^2 -2
3b) Hence, solve x^2 +x+2x√x+2 = 14
maths about equation,pls. help me
2008-08-23 8:30 am
回答 (1)
2008-08-23 9:43 am
✔ 最佳答案
The answer is as follows:圖片參考：http://i277.photobucket.com/albums/kk75/uncle_michael/080822_mat_2a.jpg?t=1219426970
圖片參考：http://i277.photobucket.com/albums/kk75/uncle_michael/080822_mat_2b.jpg?t=1219426995
收錄日期: 2021-04-23 23:05:18
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080823000051KK00179