- #1
A_Munk3y
- 72
- 0
Homework Statement
5*sqrt[x]
The Attempt at a Solution
=>5*(x)(1/2)
=>2.5x(-1/2)
is this right?
Or do you use chain rule here?
like =>5*(x)(1/2)
=>5(1/2)(x)(-1/2)*1)
=>2.5x(-1/2)*5
Deneb Cyg said:It seems redundant to use the product and chain rules together. For an equation like this one it is much simpler to just use the general power rule for derivatives:
[tex]\frac{d}{dx}[/tex]xr=rxr-1
In general the chain and product rules are only used when there are distinct functions f(x) and g(x). Doing what rygza is suggesting (though it gives you the correct answer) assumes f(x)=5 and g(x)=x1/2 for the product rule portion. But f'(x)=0. Then for the chain rule portion f(x)=5x1/2 and g(x)=x. But g'(x)=1.
So in summary you just do a bunch of extra steps before ending up with d/dx 5x1/2 which requires the power rule to solve (=2.5x-1/2)
Derivatives are a fundamental concept in calculus that represent the rate of change of a function at a specific point. They are important in mathematics because they allow us to analyze and understand the behavior of functions, such as finding maximum and minimum values, determining direction of motion, and solving optimization problems.
The chain rule is a method for finding the derivative of a composite function, which is a combination of two or more functions. To use the chain rule, we first identify the inner and outer functions, and then apply the rule: the derivative of the outer function multiplied by the derivative of the inner function.
Yes, for example, if we have the function f(x) = 5√x, the inner function is x and the outer function is √x. To find the derivative, we apply the chain rule: (5√x)' = 5(√x)' = 5(1/2√x) = 5/(2√x).
Derivatives of composite functions are used in various real-world applications, such as physics, engineering, and economics. For example, they can be used to analyze the speed and acceleration of moving objects, optimize production processes, and determine the sensitivity of financial investments to market changes.
Yes, in addition to the chain rule, there are other rules and methods for finding derivatives, such as the product rule, quotient rule, and power rule. These rules are used for different types of functions and can be combined to find the derivative of more complex functions.