Lee Meimei's answer to Lee Meimei's Secondary 3 A Maths Singapore question.
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I thought the answer should be this. By restricting the values of k, we will see the line does not intersect the curve for real values of x. And we should prove b²-4ac <0 and not the other way?
Date Posted:
4 years ago
It’s more of a question phrasing issue. Yes, for k between 1 and 4, the curve will not touch the x-axis for all x.
But the question suggests that we need to show that the curve is positive regardless of the constant k used.
But the question suggests that we need to show that the curve is positive regardless of the constant k used.
A good question will not have such ambiguities and should sound like this.
Show that for some values of k to be determined, the curve...
Show that for some values of k to be determined, the curve...
Ok noted. Thanks a lot.
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