詳細列式解答，謝謝。
1. If the equation(x-1)(x-2)+p=0 has two equal roots, find the value of p.
Ans: 1/4
2. If the equation 2x^2=(m+1)x=(m-1)=0 has one double real root, find the value of m.
Ans: 3
3. If the equation 3x^2+5x+m=0 has two unequal real roots, find the range of values of m.
Ans: m < 25/12
唔該教教我點計，謝謝!
Form 4 maths question .....
2008-09-14 5:18 am
回答 (2)
2008-09-14 5:55 am
✔ 最佳答案
The answer is as follows:圖片參考：http://i277.photobucket.com/albums/kk75/uncle_michael/080913_mat_5.jpg?t=1221314102
2008-09-14 5:29 am
用discriminant，b^2-4ac
b^2-4ac>0 ---- two unequal real roots
b^2-4ac=0 ---- one real root / two equal real roots
b^2-4ac<0 ---- no real root
b^2-4ac>0 ---- two unequal real roots
b^2-4ac=0 ---- one real root / two equal real roots
b^2-4ac<0 ---- no real root
收錄日期: 2021-04-23 23:06:40
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