1. Find the range of values of K if the equation kx^2 + 12x + 4 = 0
has no real roots,
2. Find the range of values of K if the equation 3x^2 - 15x - 4k = 0
has no real roots.
MATHS
2008-05-04 8:55 pm
回答 (1)
2008-05-04 9:02 pm
✔ 最佳答案
1.∵ The equation has no real roots,
∴∆<0
i.e. 122-4(k)(4)<0
144-16k<0
16k>144
k>16/144
k>1/9
2.
∵ The equation has no real roots,
∴∆<0
i.e. (-15)2-4(3)(-4k)<0
225+48k<0
48k<-225
k<-255/48
k<-75/16
收錄日期: 2021-04-23 20:33:59
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