(2x-5)^2 = (x-3)(6x-15)
吾要直接EXPAND 要抽FACTOR METHOD
THANK YOU!!!!!
ANSWER : 4 , 5/2
F.4 Math Quadratic Equation 急!
2012-09-08 1:34 am
回答 (5)
2012-09-08 3:23 pm
✔ 最佳答案
(2x - 5)^2 = (x - 3)(6x - 15)(2x - 5)^2 - (x - 3)(6x - 15) = 0
(2x - 5)(2x -5) - 3(x - 3)(2x - 5) = 0
(2x - 5)[2x - 5 - 3(x - 3)] = 0
2x - 5 = 0 or 2x - 5 - 3(x - 3) = 0
x = 5/2 or 2x - 5 - 3x + 9 = 0
x = 5/2 or -x + 4 = 0
x = 5/2 or 4
2012-09-09 12:21 am
(2x-5)^2 = (x-3)(6x-15)
(2x-5)(2x-5)=(x-3)‧3(2x-5)
(2x-5)(2x-5)=3(x-3)(2x-5)
2x-5=3(x-3)(2x-5)/(2x-5)
2x-5=3(x-3)‧1
2x-5=3(x-3)
2x-5=3x-9
x=4
2012-09-08 16:23:44 補充：
FACTOR METHOD 中文是乜我唔明= =?
(2x-5)(2x-5)=(x-3)‧3(2x-5)
(2x-5)(2x-5)=3(x-3)(2x-5)
2x-5=3(x-3)(2x-5)/(2x-5)
2x-5=3(x-3)‧1
2x-5=3(x-3)
2x-5=3x-9
x=4
2012-09-08 16:23:44 補充：
FACTOR METHOD 中文是乜我唔明= =?
2012-09-08 5:50 am
(2x-5)^2 = (x-3)(6x-15)
(2x-5)^2 = 3(x-3)(2x-5)
(2x-5)=3(x-3)
3x-9=2x-5
x=4
(2x-5)^2 = 3(x-3)(2x-5)
(2x-5)=3(x-3)
3x-9=2x-5
x=4
2012-09-08 1:53 am
(2x-5)^2 = (x-3)(6x-15)
4x^2-20x+25=6x^2-15x-18x=45
2x^2-13x+20=0
(x-4)(2x-5)=0
x=4 or x=5/2
4x^2-20x+25=6x^2-15x-18x=45
2x^2-13x+20=0
(x-4)(2x-5)=0
x=4 or x=5/2
2012-09-08 1:44 am
Hint:
Relate 2x - 5 with 6x - 15.
Relate 2x - 5 with 6x - 15.
收錄日期: 2021-04-13 18:58:13
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20120907000051KK00408