If The equation kxˆ2 + 2x - 5 = 0 has no real roots ,
find all possible values of k .
A . k > 1/5
B . K< -1/5
C . k≥ -1/5
D . k≤ -1/5
If The equation kxˆ2 + 2x - 5 = 0 has no real roots ,
2008-08-13 11:56 pm
回答 (2)
2008-08-14 12:11 am
✔ 最佳答案
kx2 + 2x﹣5 = 0Since the equation has no real roots,
i.e.,the discriminant < 0
Δ < 0
22﹣4(k)(-5) < 0
4 + 20k < 0
20k < -4
k < -1 / 5
the possible values of k is k < -1 / 5
So the answer is B
2008-08-29 12:23 am
GOOD
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