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Quadratic Formula of form ax2 + bx + c = 0
x = (-b +- √(b2 - 4ac))/2a
First Derivative
Arithmetic Growth Rate
Logarithmic Growth Rate
Locating Minima and Maxima of a Function
Stationary Points
Minima and maxima are what we call stationary points i.e., points of a function with a first derivative equal to zero z is a stationary point of f(x) if and only if:
Inflection Points
a point where a function’s curvature shifts or, in mathematical terms, when a function’s second derivative equals zero z is an inflection point of f(x) if and only if:
Global vs Local Optima
A function f(x) can have multiple minima and maxima
global minimum (maximum) – smallest (greatest) value of f(x) importantly, in all its domain (global -> for all xs)
local minimum (maximum) – smallest (greatest) value of f(x) in an interval of its domain (local -> for a subset of xs only)
Natural Logarithm Rule
Rule on Exponentials of Base e
Partial Derivatives
Cross-Partial Derivatives
Second Order Partial Derivatives
Optimising Multivariate Functions