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secondary 4 | A Maths
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Kathy
Kathy

secondary 4 chevron_right A Maths chevron_right Singapore

Thank you

Date Posted: 6 months ago
Views: 32
Eric Nicholas K
Eric Nicholas K
6 months ago
I will do up the answers later.
Eric Nicholas K
Eric Nicholas K
6 months ago
In qn 12, ln r and ln s are the roots, so the sum of roots is ln r + ln s, the product of roots is ln r times ln s.

But the sum of roots is still -b/a and the product of roots is still c/a.
Kathy
Kathy
6 months ago
Pls help me with full working. Thank you

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Kenneth Chee
Kenneth Chee's answer
179 answers (A Helpful Person)
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Eric Nicholas K
Eric Nicholas K's answer
3655 answers (Tutor Details)
Here are my answers. For the second question last part, it’s a lot easier (to observe) if you let a = ln r and b = ln s, so that (ln s) / (ln r) plus (ln r) / (ln s) = b/a + a/b.
Eric Nicholas K
Eric Nicholas K
6 months ago
Also note that (ln s)^2 is NOT the same as ln s^2.

i.e. ln s^2 = 2 ln s
but (ln s)^2 is NOT equal to 2 ln s