The derivative of root x is equal to (1/2) x-1/2. We can calculate this derivative using various methods of differentiation such as the first principle of derivatives, power rule of differentiation, and chain rule method. Mathematically, we can write the formula for the derivative of root x as d(√x)/dx = (1/2) x-1/2 or 1(/2√x). The formula for the power rule of derivatives is d(xn)/dx = n xn-1, where n ≠ -1. Using this formula and substituting n = 1/2, we can get the derivative of root x.

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Further, in this article, we will explore the derivative of root x and its formula using different methods of evaluating derivatives. We will also solve various examples related to the derivative of root x and other combinations of functions with root x for a better understanding of the concept.

1.What is Derivative of Root x?
2.Derivative of Root x Formula
3.Derivative of Root x Using First Principle
4.Derivative of Root x Using Power Rule
5.Application of Derivative of Root x
6.FAQs on Derivative of Root x

What is Derivative of Root x?


The derivative of root x is given by, d(√x)/dx = (1/2) x-1/2 or 1/(2√x). As we know, the derivative of a function in mathematics is the process of finding the rate of change of a function with respect to a variable. The derivative of root x can be determined using the power rule of differentiation and the first principle of derivatives. We can also use the derivative of root x along with the chain rule method for evaluating the derivatives of square root functions. In the next section, let us understand the formula for this derivative.


Derivative of Root x Formula


The formula for the derivative of root x is given by d(√x)/dx (OR) (√x)' = (1/2) x-1/2 (OR) 1/(2√x), i.e.,

*

We can evaluate the above formula for the derivative of root x using the following methods:

First Principle of Derivatives

Derivative of Root x Using First Principle


Now that we know that the derivative of root x is equal to (1/2) x-1/2, we will prove it using the first principle of differentiation. For a function f(x), its derivative according to the definition of limits, that is, the first principle of derivatives is given by the formula f'(x) = lim h→0 / h. We will also rationalization method to simplify the expression. Therefore, we have

d(√x)/dx = lim h→0 <√(x + h) - √x> / h

To simplify the expression, multiply the numerator and denominator of the above expression by √(x + h) + √x.

lim h→0 <√(x + h) - √x> / h = lim h→0 <√(x + h) - √x> × <√(x + h) + √x > / h × <√(x + h) + √x >

= lim h→0 <(x + h) - x> / h × <√(x + h) + √x > --- (Using (a+b) (a-b) = a2 - b2 formula)

= lim h→0 / h × <√(x + h) + √x >

= lim h→0 h / h × <√(x + h) + √x >

= lim h→0 1 / <√(x + h) + √x >

= 1/(√x + √x)

= 1/(2√x)

Hence, we have proved the formula for the derivative of root x.


Derivative of Root x Using Power Rule


Now, the formula for the power rule of derivatives is given by, d(xn)/dx = nxn-1, where n ≠ -1. Root x is an exponential function with x as the base and 1/2 as the power. Now, if we substitute n = 1/2 in the formula d(xn)/dx = nxn-1, where n ≠ -1, then we have

d(x1/2)/dx = (1/2) x(1/2) - 1

= (1/2) x-1/2

= 1/(2√x)

Therefore, we have proved that the derivative of root x is equal to 1/(2√x).


Application of Derivative of Root x


One of the important applications of the derivative of root x is to find the derivative of square root functions. We can apply the chain rule method of differentiation to find the derivatives of square root function along with using the derivative of root x. Let us solve an example to understand its application.

Example: Find the derivative of √(2x + 5).

Solution: To find the derivative of √(2x + 5), we will use the chain rule method and use the formula of the derivative of root x.

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d(√(2x + 5))/dx = d(√(2x + 5))/d(2x + 5) × d(2x + 5)/dx

= 1/(2√(2x + 5)) × 2

= 2/(2√(2x + 5))

= 1/√(2x + 5)

Important Notes on Derivative of Root x

The derivative of root x is given by d(√x)/dx = (1/2) x-1/2 or 1/(2√x).Root x given by √x is an exponential function with x as the variable and base as 1/2.We can calculate the derivative of root x using the Power Rule and First Principle of Derivatives.

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