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secondary 3 | A Maths
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Piranha
Piranha

secondary 3 chevron_right A Maths chevron_right Singapore

Need help please

Date Posted: 4 years ago
Views: 190
Jonathan yeo
Jonathan Yeo
4 years ago
A and C must be negative.
Eric Nicholas K
Eric Nicholas K
4 years ago
It’s not sufficient to say that both a and c are negative. What happens if a = -1 and c = -1?

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Eric Nicholas K
Eric Nicholas K's answer
5997 answers (Tutor Details)
1st
When a curve is always negative, the graph only resides below the x-axis all the time. This implies that the curve must be sad face. Smiley face curves cannot ever be “always below the x-axis” because it will always go up at both ends.

Also, the fact that the graph only resides below the x-axis means that the curve will never ever cut the x-axis, so the equation will not have any real roots at all.