f.4,,amathz
2008-09-27 10:27 pm
If the equation (x+1)(x+2)=m(3x+7) has equal roots, find the values of m.
回答 (1)
2008-09-27 10:38 pm
✔ 最佳答案
將 (x+1)(x+2) 乘埋佢x^2 + 3x + 2 = 3mx + 7m (x^2 means xo既2次方)
x^2 + (3 - 3m)x + 2 - 7m = 0
because equal roots
所以 discriminant = 0
(3 - 3m)^2 - 4(1)(2 - 7m) = 0
solve 左佢就可以計到喇
唔洗我做啦
禁機幾個制就可以計到
參考: 我而家f.7 ^^
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