[中四數]Functions and Graph[20分]

Consider the equation (k+2)x^2 - (2k+1)x + (k-3) = 0 ......(*)

(a) Find the discriminant of (*) in terms of k.
(b) Find the range of values of k if (*) has
(i)two unequal real roots
(ii)two equal real roots
(iii)no real root

以下是答案 不會列式 求過程

(a)8k+25
(b) (i) k>-25/8 (ii) k=-25/8 (iii) k<-25/8



另一條問題在下面的網址裡
只有1題而已

http://hk.myblog.yahoo.com/number20008/article?new=1&mid=39