How do I factorise this X^2 - 2x + 15= 0?
回答 (3)
2016-05-22 8:05 pm
Perhaps you meant x^2 -2x -15 ? (x+3)(x-5) =0
2016-05-22 7:57 pm
Since there is no number in front of the x^2 term, you are looking for two numbers that mulitply to give you +15 and added together give you -2.
However, this does not appear possible. Did you mistype the equation? Maybe it was - 15?
However, this does not appear possible. Did you mistype the equation? Maybe it was - 15?
2016-05-22 8:14 pm
x2 - 2x + 15 = 0
(x - 5)(x + 3) = 0
x = 5 or -3
(x - 5)(x + 3) = 0
x = 5 or -3
收錄日期: 2021-04-21 18:43:59
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https://hk.answers.yahoo.com/question/index?qid=20160522115447AAnnzZz