# How to write a difference quotient and derivative

To fix this we will use the first and second properties of radicals above.

Building Intuition for the Derivative How do you wish the derivative was explained to you? The derivative is the heart of calculus, buried inside this definition: But what does it mean?

What could you do? You could even stop using the monkeys that pick random stocks for your portfolio. Like this magic newspaper, the derivative is a crystal ball that explains exactly how a pattern will change.

That's pretty interesting, more than the typical "the derivative is the slope of a function" description. Let's step away from the gnarly equation. Equations exist to convey ideas: Derivatives create a perfect model of change from an imperfect guess.

This result came over thousands of years of thinking, from Archimedes to Newton. Let's look at the analogies behind it. We all live in a shiny continuum Infinity is a constant source of paradoxes "headaches": A line is made up of points?

So there's an infinite number of points on a line? How do you cross a room when there's an infinite number of points to visit? And yet, we move. My intuition is to fight infinity with infinity.

Sure, there's infinity points between 0 and 1. But I move two infinities of points per second somehow!

Derivatives of exponential functions involve the natural logarithm function, which itself is an important limit in Calculus, as well as the initial exponential function. The derivative is the natural logarithm of the base times the original function. In single-variable calculus, the difference quotient is usually the name for the expression (+) − ()which when taken to the limit as h approaches 0 gives the derivative of the function f. The name of the expression stems from the fact that it is the quotient of the difference of values of the function by the difference of the corresponding values of its argument (the latter is (x+h)-x=h in. Difference Quotient. This slope is very important in calculus where it is used to define the derivative of function f which in fact defines the local variation of a function in mathematics. In the examples below, we calculate and simplify the difference quotients of different functions. Example 1: .

Distance has infinite points, motion is possible, therefore motion is in terms of "infinities of points per second". Instead of thinking of differences "How far to the next point? To do this, I travel 2 'infinities' for each unit of time".

See division as a rate of motion through a continuum of points What's after zero? What number comes after zero?

Anything you can name, I can name smaller I'll just halve your number Even though we can't calculate the number after zero, it must be there, right? Like demons of yore, it's the "number that cannot be written, lest ye be smitten".

Call the gap to the next number "dx".

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I don't know exactly how big it is, but it's there! Measurements depend on the instrument The derivative predicts change. Ok, how do we measure speed change in distance?

 Stocks Terms and Definitions A straight line has one and only one slope; one and only one rate of change. If x represents time, for example, and y represents distance, then a straight line graph that relates them indicates constant speed. Math Questions and Answers - regardbouddhiste.com We ended up with — 5 x0 in the second term of the function by assuming the exponent in -5x could be written as -5x1, so we multiply it by the coefficient in front of the x, which is BetterExplained Books for Kindle and Print If f is differentiable at a, then f must also be continuous at a.

Do you know how fast you were going? I have no idea. But I haven't been driving for an hour!

We clearly don't need a "full hour" to measure your speed. We can take a before-and-after measurement over 1 second, let's say and get your instantaneous speed.Section Proof of Various Derivative Properties. In this section we’re going to prove many of the various derivative facts, formulas and/or properties that we encountered in the early part of the Derivatives chapter.

Not all of them will be proved here and some will only be proved for special cases, but at least you’ll see that some of them aren’t just . That slope, that limit, will be the value of what we will call the derivative. The difference quotient. Let y = f(x) be a continuous function, and let the coördinates of a fixed point P on the graph be But to simplify the written calculations, then instead of writing Δx, we will write h.

Difference quotient - used to calculate the slope of the secant line between two points on the graph of a function, f Secant line - any line that passes between two points on a curve. Math Questions and Answers - Discover the regardbouddhiste.com community of teachers, mentors and students just like you that can answer any question you might have on Math.

The derivative of a function of a real variable measures the sensitivity to change of the function value (output value) with respect to a change in its argument (input value).