# How do you Linearize a multivariable function?

## How do you Linearize a multivariable function?

The Linearization of a function f(x,y) at (a,b) is L(x,y) = f(a,b)+(x−a)fx(a,b)+(y−b)fy(a,b). This is very similar to the familiar formula L(x)=f(a)+f′(a)(x−a) functions of one variable, only with an extra term for the second variable.

**What is linearization in Calc?**

Lecture 10: Linearization. In single variable calculus, you have seen the following definition: The linear approximation of f(x) at a point a is the linear function L(x) = f(a) + f/(a)(x – a) .

### How do you find the linear approximation of a multivariable function?

The linear approximation in one-variable calculus The equation of the tangent line at i=a is L(i)=r(a)+r′(a)(i−a), where r′(a) is the derivative of r(i) at the point where i=a. The tangent line L(i) is called a linear approximation to r(i). The fact that r(i) is differentiable means that it is nearly linear around i=a.

**How does linearization work?**

In mathematics, linearization is finding the linear approximation to a function at a given point. In the study of dynamical systems, linearization is a method for assessing the local stability of an equilibrium point of a system of nonlinear differential equations or discrete dynamical systems.

#### How do you Linearize an equation in calculus?

Suppose we want to find the linearization for .

- Step 1: Find a suitable function and center.
- Step 2: Find the point by substituting it into x = 0 into f ( x ) = e x .
- Step 3: Find the derivative f'(x).
- Step 4: Substitute into the derivative f'(x).

**Why do we use linearization?**

Linearization can be used to give important information about how the system behaves in the neighborhood of equilibrium points. Typically we learn whether the point is stable or unstable, as well as something about how the system approaches (or moves away from) the equilibrium point.

## How to get a linearization of a function?

In one dimensional calculus we tracked the tangent line to get a linearization of a function. With functions of several variables we track the tangent plane. Since the equation of the tangent plane at ( a, b, f ( a, b)) is L ( x, y) = f ( a, b) + ( x − a) f x ( a, b) + ( y − b) f y ( a, b).

**How are partial derivatives used in linearization calculus?**

Linearization Partial derivatives allow us to approximate functions just like ordinary derivatives do, only with a contribution from each variable. In one dimensional calculus we tracked the tangent line to get a linearization of a function. With functions of several variables we track the tangent plane.

### How is the first chain rule written in calculus?

Note that all we’ve done is change the notation for the derivative a little. With the first chain rule written in this way we can think of (1) as a formula for differentiating any function of x and y with respect to θ provided we have x = r cos θ and y = r sin θ . This however is exactly what we need to do the two new derivatives we need above.

**How to remember the form of the chain rule?**

One way to remember this form of the chain rule is to note that if we think of the two derivatives on the right side as fractions the dx ’s will cancel to get the same derivative on both sides. Okay, now that we’ve got that out of the way let’s move into the more complicated chain rules that we are liable to run across in this course.