quadratic

2011-06-06 7:08 pm
consider two quadratic functions f(x)=kx^2 +10x -5 and g(x)= 5x^2 +kx +k , where k>0

(a) find the range of possible values of k such that f(x) <_ g(x) for all real values of x
( 我吾識打<_ 姐係代表細過或=)

(b) if the value of k found in (a) is an integer , find the possible values of k
更新1:

點樣知道 三角形<_0 同埋0<5????????

更新2:

0<5????????

更新3:

0 < k <5?

回答 (1)

2011-06-06 8:23 pm
✔ 最佳答案

圖片參考:http://i.imgur.com/iPgvX.gif


http://i.imgur.com/iPgvX.gif

2011-06-06 16:44:21 補充:
f(x) -g(x)<=0
所以判別式<=0


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