The graph of y=ax2次-8x-4 lies below the x-axis for all valus of x.Find the range of possible values of a.
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中四數學題
2008-09-28 11:12 pm
回答 (2)
2008-09-28 11:57 pm
✔ 最佳答案
The graph of y=ax2-8x-4 lies below the x-axis for all valus of x.Find the range of possible values of a.lies below the x-axis for all valus of x => no intercept with x - axisthat meansΔ < 0
y=ax2-8x-4
Δ=(-8)2- 4(a)(-4)
=64+16a
64 + 16a < 0
64< -16a
-4 > a
so the range of possible values of a is -4 > a
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