# Linearizing

## Linearizing :

Linearizing is a mathematical method used to approximate a non-linear function with a linear one. This can be useful in situations where a non-linear function is difficult to work with, or when a linear approximation is desired for simplicity or ease of calculation.
One common example of linearizing is with the exponential function. The exponential function is defined as y = a^x, where a is a constant greater than 0. This function is non-linear, as the value of y increases at an increasing rate as x increases.
To linearize this function, we can use the Taylor series expansion, which approximates the exponential function as a series of terms involving powers of x. The first two terms of the Taylor series for the exponential function are y = 1 + ax + (1/2!)ax^2 + …
If we only consider the first two terms of the Taylor series, we can approximate the exponential function as a linear function with the equation y = 1 + ax. This linear approximation is valid for small values of x, where the higher-order terms in the Taylor series can be ignored.
For example, let’s consider the function y = 2^x. We can linearize this function by using the first two terms of the Taylor series: y = 1 + 2x. This linear approximation is valid for x values between -1 and 1, where the higher-order terms in the Taylor series are small compared to the first two terms.
Another example of linearizing is with the logarithmic function. The logarithmic function is defined as y = log(x), where x is a positive real number. This function is non-linear, as the value of y increases at a decreasing rate as x increases.
To linearize this function, we can use the Taylor series expansion, which approximates the logarithmic function as a series of terms involving powers of x. The first two terms of the Taylor series for the logarithmic function are y = x – (1/2)x^2 + (1/3)x^3 + …
If we only consider the first two terms of the Taylor series, we can approximate the logarithmic function as a linear function with the equation y = x – (1/2)x^2. This linear approximation is valid for small values of x, where the higher-order terms in the Taylor series can be ignored.
For example, let’s consider the function y = log(x). We can linearize this function by using the first two terms of the Taylor series: y = x – (1/2)x^2. This linear approximation is valid for x values between 0 and 2, where the higher-order terms in the Taylor series are small compared to the first two terms.
Overall, linearizing is a useful mathematical method for approximating non-linear functions with linear ones. This can be particularly useful in situations where a non-linear function is difficult to work with, or when a linear approximation is desired for simplicity or ease of calculation.