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secondary 3 | A Maths
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secondary 3 chevron_right A Maths chevron_right Singapore

how to do 18(c)and 19(b)??helpp!

Date Posted: 3 months ago
Views: 30
Eric Nicholas K
Eric Nicholas K
3 months ago
The other tutor has done a good job of coming up with the answers, so I will not be writing any here, but instead bring up an important point.

For Q19, it is important that the values of a must be positive.

This is because only smiley face graphs are capable of being 'always positive'.

Sad face graphs (a < 0) can never be 'always positive', while the case a = 0 leads to straight lines which is mainly assumed to never be 'always positive' (exceptions are horizontal lines above the x-axis).

In the case of the question, fortunately, the range a > 25/8 is already above zero, so no further manupulation is required.

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Phylicia Tong
Phylicia Tong's answer
190 answers (A Helpful Person)
Hope this helps