Erfana Beevee Binte Hassan Shariff's answer to Jung Wook Young's Secondary 4 A Maths Singapore question.
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For 4(a), use laws of natural log to split ln (a/b) into ln a - ln b, and then differentiate.
For (b), to show it is a decreasing function, dy/dx <0. -11 <0. So for dy/dx to be <0, thr denominator >0. So, (2+x)(3x-5) >0.
Hope this helps.
For (b), to show it is a decreasing function, dy/dx <0. -11 <0. So for dy/dx to be <0, thr denominator >0. So, (2+x)(3x-5) >0.
Hope this helps.
Date Posted:
8 months ago
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