quadratic equation
2010-09-26 9:06 pm
If the graph of y=(k-1)x^2-8x+4 jas no x -intercept,,find the range of possible values of k.
回答 (1)
2010-09-26 9:16 pm
✔ 最佳答案
The graph has no x-interceptHence Δ < 0,
(-8)^2 - 4(k-1)(4) < 0
64 - 16(k-1) < 0
4 - k + 1 < 0
5 - k < 0
k > 5
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