Positive derivative means increasing.
Negative derivative means decreasing.
But why?
In this short lesson, Professor Cartouche explains the meaning behind the derivative sign using a simple example:
f(x) = x² – 4x
You’ll learn how to:
Find the derivative
Find the critical point
Test intervals
Know where the function is increasing or decreasing
No memorization. Just direction.
Follow for simple math explanations that finally make sense.
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