Eric Nicholas K's answer to Kathy's Secondary 4 A Maths Singapore question.
done
{{ upvoteCount }} Upvotes
clear
{{ downvoteCount * -1 }} Downvotes
Q19
Four concepts are needed for this question.
1. Ability to obtain an expression for dy/dx
2. Understanding that being a decreasing function means dy/dx < 0 and an inequality needs to be formulated subsequently
3. Understanding that e (or any positive number) to the power of any real number will always be positive (never negative, and not even zero) and will not affect any inequality sign
4. Ability to solve quadratic inequalities, this will be your inequalities revision
Four concepts are needed for this question.
1. Ability to obtain an expression for dy/dx
2. Understanding that being a decreasing function means dy/dx < 0 and an inequality needs to be formulated subsequently
3. Understanding that e (or any positive number) to the power of any real number will always be positive (never negative, and not even zero) and will not affect any inequality sign
4. Ability to solve quadratic inequalities, this will be your inequalities revision
Date Posted:
4 years ago
360 Tutoring Program